gh-15512: Sync upstream Firefox to version 156.0.1 (gh-15515)

Co-authored-by: mr. m <91018726+mr-cheffy@users.noreply.github.com>
Signed-off-by: fen4flo <75260616+FlorianButz@users.noreply.github.com>

.github/workflows/build.yml

@@ -26,6 +26,11 @@ on:
         required: true
         type: "boolean"
         default: false
+      disable-pgo:
+        description: "Build without PGO (skips the profile generation stages)"
+        required: false
+        type: "boolean"
+        default: false
   workflow_call:
     inputs:
       create_release:
@@ -48,6 +53,11 @@ on:
         required: true
         type: "boolean"
         default: false
+      disable-pgo:
+        description: "Build without PGO (skips the profile generation stages)"
+        required: false
+        type: "boolean"
+        default: false
 
 jobs:
   buildid:
@@ -73,6 +83,7 @@ jobs:
           echo "create_release: ${{ inputs.create_release }}"
           echo "update_version: ${{ inputs.update_version }}"
           echo "use sccache: ${{ inputs.use-sccache }}"
+          echo "disable-pgo: ${{ inputs.disable-pgo }}"
           echo "update_branch: ${{ inputs.update_branch }}"
           echo "GITHUB_REPOSITORY: ${{ github.repository }}"
           echo "GITHUB_REPOSITORY_OWNER: ${{ github.repository_owner }}"
@@ -102,14 +113,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Download aws-cli
-        if: ${{ inputs.create_release && inputs.update_branch == 'release' }}
+        if: ${{ inputs.update_branch == 'release' }}
         run: |
           curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
           unzip awscliv2.zip
           sudo ./aws/install --update
 
       - name: Start self-hosted runner
-        if: ${{ inputs.create_release && inputs.update_branch == 'release' }}
+        if: ${{ inputs.update_branch == 'release' }}
         run: |
           echo "Starting self-hosted runner"
           echo "${{ secrets.SELF_HOSTED_RUNNER_START_SCRIPT }}" | base64 -d > start.sh
@@ -117,7 +128,7 @@ jobs:
           bash ./start.sh
 
       - name: Remove self-hosted runner script
-        if: always() && ${{ inputs.create_release && inputs.update_branch == 'release' }}
+        if: always() && ${{ inputs.update_branch == 'release' }}
         run: |
           echo "Removing self-hosted runner script"
           rm start.sh || true
@@ -280,6 +291,7 @@ jobs:
   windows-step-1:
     name: Windows build step 1 (PGO build)
     uses: ./.github/workflows/windows-release-build.yml
+    if: ${{ !inputs.disable-pgo }}
     needs: [build-data, buildid]
     permissions:
       contents: write
@@ -295,6 +307,7 @@ jobs:
   windows-step-2:
     name: Windows build step 2 (Generate profile data)
     uses: ./.github/workflows/windows-profile-build.yml
+    if: ${{ !inputs.disable-pgo }}
     permissions:
       contents: write
     secrets: inherit
@@ -310,10 +323,13 @@ jobs:
     permissions:
       contents: write
     secrets: inherit
+    # windows-step-2 is skipped when PGO is disabled, so don't inherit its skip
+    if: ${{ !failure() && !cancelled() }}
     needs: [build-data, windows-step-2, start-self-host, buildid]
     with:
       build-version: ${{ needs.build-data.outputs.version }}
       generate-pgo: false
+      disable-pgo: ${{ inputs.disable-pgo }}
       release-branch: ${{ inputs.update_branch }}
       MOZ_BUILD_DATE: ${{needs.buildid.outputs.buildids}}
       use-sccache: ${{ inputs.use-sccache }}
@@ -330,10 +346,12 @@ jobs:
       release-branch: ${{ inputs.update_branch }}
       MOZ_BUILD_DATE: ${{needs.buildid.outputs.buildids}}
       use-sccache: ${{ inputs.use-sccache }}
+      disable-pgo: ${{ inputs.disable-pgo }}
 
   mac-step-1:
     name: macOS build step 1 (PGO build)
     uses: ./.github/workflows/macos-release-build.yml
+    if: ${{ !inputs.disable-pgo }}
     needs: [build-data, buildid]
     permissions:
       contents: write
@@ -348,6 +366,7 @@ jobs:
   mac-step-2:
     name: macOS build step 2 (Generate profile data)
     uses: ./.github/workflows/macos-profile-build.yml
+    if: ${{ !inputs.disable-pgo }}
     permissions:
       contents: write
     secrets: inherit
@@ -362,10 +381,13 @@ jobs:
     permissions:
       contents: write
     secrets: inherit
+    # mac-step-2 is skipped when PGO is disabled, so don't inherit its skip
+    if: ${{ !failure() && !cancelled() }}
     needs: [build-data, mac-step-2, start-self-host, buildid]
     with:
       build-version: ${{ needs.build-data.outputs.version }}
       generate-pgo: false
+      disable-pgo: ${{ inputs.disable-pgo }}
       release-branch: ${{ inputs.update_branch }}
       MOZ_BUILD_DATE: ${{needs.buildid.outputs.buildids}}
       use-sccache: ${{ inputs.use-sccache }}
@@ -470,14 +492,14 @@ jobs:
     if: always()
     steps:
       - name: Download aws-cli
-        if: ${{ inputs.create_release && inputs.update_branch == 'release' }}
+        if: ${{ inputs.update_branch == 'release' }}
         run: |
           curl "https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip" -o "awscliv2.zip"
           unzip awscliv2.zip
           sudo ./aws/install --update
 
       - name: Stop self-hosted runner
-        if: ${{ inputs.create_release && inputs.update_branch == 'release' }}
+        if: ${{ inputs.update_branch == 'release' }}
         run: |
           echo "Stopping self-hosted runner"
           echo "${{ secrets.SELF_HOSTED_RUNNER_STOP_SCRIPT }}" | base64 -d > stop.sh
@@ -485,13 +507,12 @@ jobs:
           bash ./stop.sh > /dev/null
 
       - name: Remove self-hosted runner script
-        if: always() && ${{ inputs.create_release && inputs.update_branch == 'release' }}
+        if: always() && ${{ inputs.update_branch == 'release' }}
         run: |
           echo "Removing self-hosted runner script"
           rm stop.sh || true
 
   release:
-    if: ${{ inputs.create_release || inputs.update_branch == 'twilight' }}
     permissions: write-all
     name: Release
     needs:
@@ -585,6 +606,7 @@ jobs:
 
       - name: Commit
         uses: stefanzweifel/git-auto-commit-action@v5
+        if: ${{ inputs.create_release || inputs.update_branch == 'twilight' }}
         with:
           commit_message: 🚀 Update update manifests
           commit_user_name: Zen Browser Robot
@@ -628,9 +650,22 @@ jobs:
         env:
           GITHUB_REPOSITORY: ${{ github.repository }}
 
+      - name: Upload signed MAR files to workflow artifacts
+        if: ${{ inputs.update_branch == 'release' && !inputs.create_release }}
+        uses: actions/upload-artifact@v4
+        with:
+          retention-days: 5
+          name: signed-mar-files
+          path: |
+            ./linux.mar/*
+            ./linux-aarch64.mar/*
+            ./.github/workflows/object/windows-x64-signed-x86_64/windows.mar
+            ./.github/workflows/object/windows-x64-signed-arm64/windows-arm64.mar
+            ./macos.mar/*
+
       - name: Release
         uses: softprops/action-gh-release@v2.2.2
-        if: ${{ inputs.update_branch == 'release' }}
+        if: ${{ inputs.update_branch == 'release' && inputs.create_release }}
         with:
           token: ${{ secrets.DEPLOY_KEY }}
           tag_name: ${{ needs.build-data.outputs.version }}

.github/workflows/linux-release-build.yml

@@ -20,6 +20,11 @@ on:
         required: true
         type: boolean
         default: false
+      disable-pgo:
+        description: "Build without PGO at all"
+        required: false
+        type: boolean
+        default: false
 
 jobs:
   build-linux:
@@ -122,7 +127,7 @@ jobs:
           cd ..
 
       - name: Build (PGO stage 1 - generate)
-        if: ${{ matrix.arch == 'x86_64' }}
+        if: ${{ matrix.arch == 'x86_64' && !inputs.disable-pgo }}
         env:
           SURFER_COMPAT: ${{ matrix.arch }}
           ZEN_RELEASE_BRANCH: ${{ inputs.release-branch }}
@@ -139,7 +144,7 @@ jobs:
           bash .github/workflows/src/release-build.sh
 
       - name: Generate PGO profile data
-        if: ${{ matrix.arch == 'x86_64' }}
+        if: ${{ matrix.arch == 'x86_64' && !inputs.disable-pgo }}
         run: |
           set -x
           export DISPLAY=:2
@@ -157,6 +162,7 @@ jobs:
         env:
           SURFER_COMPAT: ${{ matrix.arch }}
           ZEN_RELEASE_BRANCH: ${{ inputs.release-branch }}
+          ZEN_GA_DISABLE_PGO: ${{ inputs.disable-pgo && '1' || '' }}
           ZEN_SAFEBROWSING_API_KEY: ${{ secrets.ZEN_SAFEBROWSING_API_KEY }}
           ZEN_MOZILLA_API_KEY: ${{ secrets.ZEN_MOZILLA_API_KEY }}
           ZEN_GOOGLE_LOCATION_SERVICE_API_KEY: ${{ secrets.ZEN_GOOGLE_LOCATION_SERVICE_API_KEY }}

.github/workflows/macos-profile-build.yml

@@ -23,7 +23,6 @@ jobs:
       fail-fast: false
       matrix:
         arch: [x86_64, aarch64]
-
     runs-on: ${{ matrix.arch == 'x86_64' && 'macos-15-intel' || 'macos-26' }}
 
     steps:

.github/workflows/macos-release-build.yml

@@ -10,6 +10,11 @@ on:
         required: true
         type: boolean
         default: false
+      disable-pgo:
+        description: "Build without PGO at all"
+        required: false
+        type: boolean
+        default: false
       build-version:
         description: "The version to build"
         required: true
@@ -140,13 +145,13 @@ jobs:
 
       - name: Download artifact (if use profdata)
         uses: actions/download-artifact@v4
-        if: ${{ !inputs.generate-pgo }}
+        if: ${{ !inputs.generate-pgo && !inputs.disable-pgo }}
         with:
           path: ~/artifact
           name: macos-profdata-${{ matrix.arch }}
 
       - name: Show artifact info
-        if: ${{ !inputs.generate-pgo }}
+        if: ${{ !inputs.generate-pgo && !inputs.disable-pgo }}
         run: |
           ls ~/artifact
           ls ~/artifact/en-US.log
@@ -166,6 +171,9 @@ jobs:
           if test ${{ inputs.generate-pgo }} = true; then
             export ZEN_GA_GENERATE_PROFILE=1
           fi
+          if test ${{ inputs.disable-pgo }} = true; then
+            export ZEN_GA_DISABLE_PGO=1
+          fi
           if [[ -n ${{ inputs.MOZ_BUILD_DATE }} ]];then
             export MOZ_BUILD_DATE=${{ inputs.MOZ_BUILD_DATE }}
           fi

.github/workflows/windows-profile-build.yml

@@ -27,7 +27,6 @@ jobs:
       fail-fast: false
       matrix:
         arch: [x86_64, aarch64]
-
     runs-on: ${{ inputs.release-branch == 'release' && 'windows-latest' || 'windows-latest' }}
 
     steps:

.github/workflows/windows-release-build.yml

@@ -10,6 +10,11 @@ on:
         required: true
         type: boolean
         default: false
+      disable-pgo:
+        description: "Build without PGO at all"
+        required: false
+        type: boolean
+        default: false
       build-version:
         description: "The version to build"
         required: true
@@ -202,8 +207,10 @@ jobs:
           fi
           # Stored in build/windows/.windows-rs-version
           WINDOWS_RS_VERSION=$(cat build/windows/.windows-rs-version)
+          curl -fsSL "https://static.crates.io/crates/cargo-download/cargo-download-0.1.2.crate" | tar xz -C /tmp
+          (cd /tmp/cargo-download-0.1.2 && cargo generate-lockfile && cargo update tinyvec --precise 1.12.0)
+          RUSTFLAGS="--cap-lints=allow" cargo install --path /tmp/cargo-download-0.1.2 --locked
           cd engine/
-          cargo install cargo-download --locked
           cargo download -x windows=$WINDOWS_RS_VERSION
           export CARGO_INCREMENTAL=0
           echo "" >> ../configs/common/mozconfig
@@ -215,13 +222,13 @@ jobs:
 
       - name: Download artifact (if use profdata)
         uses: actions/download-artifact@v4
-        if: ${{ !inputs.generate-pgo && matrix.arch == 'x86_64' }}
+        if: ${{ !inputs.generate-pgo && !inputs.disable-pgo && matrix.arch == 'x86_64' }}
         with:
           path: ~/artifact
           name: windows-profdata-${{ matrix.arch == 'aarch64' && 'arm64' || matrix.arch }}
 
       - name: Show artifact info
-        if: ${{ !inputs.generate-pgo && matrix.arch == 'x86_64' }}
+        if: ${{ !inputs.generate-pgo && !inputs.disable-pgo && matrix.arch == 'x86_64' }}
         run: |
           ls ~/artifact
           ls ~/artifact/en-US.log
@@ -246,6 +253,9 @@ jobs:
           if test ${{ inputs.generate-pgo }} = true; then
             export ZEN_GA_GENERATE_PROFILE=1
           fi
+          if test ${{ inputs.disable-pgo }} = true; then
+            export ZEN_GA_DISABLE_PGO=1
+          fi
           if [[ -n ${{ inputs.MOZ_BUILD_DATE }} ]];then
             export MOZ_BUILD_DATE=${{ inputs.MOZ_BUILD_DATE }}
           fi

.rust-toolchain

@@ -1 +1 @@
-1.94.1
+1.95.0

README.md

@@ -34,8 +34,8 @@ Zen is a firefox-based browser with the aim of pushing your productivity to a ne
 
 ### Firefox Versions
 
-- [`Release`](https://zen-browser.app/download) - Is currently built using Firefox version `154.0.1`!
-- [`Twilight`](https://zen-browser.app/download?twilight) - Is currently built using Firefox version `RC 154.0.1`!
+- [`Release`](https://zen-browser.app/download) - Is currently built using Firefox version `156.0.1`!
+- [`Twilight`](https://zen-browser.app/download?twilight) - Is currently built using Firefox version `RC 156.0.1`!
 
 ### Contributing
 

build/firefox-cache/l10n-last-commit-hash

@@ -1 +1 @@
-bf4b57fd7fe94054457be7018e8e7beaf754c520
+782b15a7c771795a323e9403340c029e7c8d7629

build/windows/sign.ps1

@@ -147,9 +147,9 @@ function SignAndPackage($name) {
     $env:ZEN_SETUP_EXE_PATH="$PWD\windsign-temp\windows-x64-obj-$name\browser\installer\windows\instgen\setup.exe"
 
     if ($name -eq "arm64") {
-        $env:WIN32_REDIST_DIR="$PWD\win-cross\vs2026\VC\Redist\MSVC\14.50.35710\arm64\Microsoft.VC145.CRT"
+        $env:WIN32_REDIST_DIR="$PWD\win-cross\vs2026\VC\Redist\MSVC\14.51.36231\arm64\Microsoft.VC145.CRT"
     } else {
-        $env:WIN32_REDIST_DIR="$PWD\win-cross\vs2026\VC\Redist\MSVC\14.50.35710\x64\Microsoft.VC145.CRT"
+        $env:WIN32_REDIST_DIR="$PWD\win-cross\vs2026\VC\Redist\MSVC\14.51.36231\x64\Microsoft.VC145.CRT"
     }
 
     $env:MAR="..\\build\\windows\\mar.exe"

configs/common/mozconfig

@@ -53,7 +53,10 @@ fi
 if test "$ZEN_RELEASE"; then
 
   ac_add_options --enable-clang-plugin
-  ac_add_options --enable-bootstrap=-sccache
+  
+  if ! test "$ZEN_DISABLE_BOOTSTRAP"; then
+    ac_add_options --enable-bootstrap=-sccache
+  fi
 
   ac_add_options --enable-optimize
 
@@ -69,16 +72,11 @@ if test "$ZEN_RELEASE"; then
   ac_add_options --disable-geckodriver
   ac_add_options --disable-rust-tests
 
-  if ! test "$ZEN_DISABLE_LTO"; then
-    # only enable full LTO when ZEN_RELEASE_BRANCH is 'release'
-    if test "$ZEN_RELEASE_BRANCH" = "release"; then
-      # TODO: make it "full" once we have the resources to build it
-      export MOZ_LTO=cross,full
-      ac_add_options --enable-lto=cross,full
-    else
-      export MOZ_LTO=cross,thin
-      ac_add_options --enable-lto=cross,thin
-    fi
+  if test "$ZEN_DISABLE_LTO"; then
+    ac_add_options --disable-lto
+  else
+    export MOZ_LTO=cross,thin
+    ac_add_options --enable-lto=cross,thin
   fi
 
   mk_add_options MOZILLA_OFFICIAL=1

configs/linux/mozconfig

@@ -9,6 +9,9 @@ if test "$ZEN_RELEASE"; then
 
         # Enable Profile Guided Optimization
         if ! test "$ZEN_GA_DISABLE_PGO"; then
+            export MOZ_LTO=cross,full
+            ac_add_options --enable-lto=cross,full
+
             if test "$ZEN_GA_GENERATE_PROFILE"; then
                 mk_add_options "export MOZ_AUTOMATION_PACKAGE_GENERATED_SOURCES=0"
                 ac_add_options --enable-profile-generate=cross

configs/windows/mozconfig

@@ -15,9 +15,9 @@ if test "$ZEN_CROSS_COMPILING"; then
   CROSS_COMPILE=1
 
   if test "$SURFER_COMPAT" = "aarch64"; then
-    export WIN32_REDIST_DIR="$WINSYSROOT/VC/Redist/MSVC/14.50.35710/arm64/Microsoft.VC145.CRT"
+    export WIN32_REDIST_DIR="$WINSYSROOT/VC/Redist/MSVC/14.51.36231/arm64/Microsoft.VC145.CRT"
   else
-    export WIN32_REDIST_DIR="$WINSYSROOT/VC/Redist/MSVC/14.50.35710/x64/Microsoft.VC145.CRT"
+    export WIN32_REDIST_DIR="$WINSYSROOT/VC/Redist/MSVC/14.51.36231/x64/Microsoft.VC145.CRT"
   fi
 fi
 
@@ -45,6 +45,9 @@ if test "$ZEN_CROSS_COMPILING"; then
       ac_add_options --enable-profile-use=cross
       ac_add_options --with-pgo-profile-path=$(echo ~)/artifact/merged.profdata
       ac_add_options --with-pgo-jarlog=$(echo ~)/artifact/en-US.log
+
+      export MOZ_LTO=cross,full
+      ac_add_options --enable-lto=cross,full
     fi
   fi
 fi

crowdin.yml

@@ -26,3 +26,5 @@ files:
     translation: browser/browser/zen-space-routing.ftl
   - source: en-US/browser/browser/zen-command-palette.ftl
     translation: browser/browser/zen-command-palette.ftl
+  - source: en-US/browser/browser/zen-share.ftl
+    translation: browser/browser/zen-share.ftl

locales/en-US/browser/browser/preferences/zen-preferences.ftl

@@ -64,6 +64,14 @@ zen-tabs-select-recently-used-on-close =
 zen-tabs-close-on-back-with-no-history =
     .label = Close tab and switch to its owner tab (or most recently used tab) when going back with no history
 
+zen-settings-workspaces-sync =
+    .label = Sync your sidebar across devices
+    .description = Keep your workspaces, pinned tabs and folders in sync on all your devices through your Mozilla account.
+
+zen-settings-normal-tabs-sync =
+    .label = Include unpinned tabs
+    .description = Also sync the regular tabs of each space, not just your pinned tabs and folders.
+
 zen-settings-workspaces-sync-unpinned-tabs =
     .label = Sync only pinned tabs in workspaces
 

locales/en-US/browser/browser/zen-command-palette.ftl

@@ -5,6 +5,8 @@
 zen-action-toggle-compact-mode = Toggle Compact Mode
 zen-action-open-theme-picker = Open Theme Picker
 zen-action-new-split-view = New Split View
+zen-action-unsplit-view = Expand current view
+zen-action-new-space = New Space
 zen-action-new-folder = New Folder
 zen-action-copy-current-url = Copy Current URL
 zen-action-settings = Settings
@@ -18,6 +20,9 @@ zen-action-new-boost = New Boost
 zen-action-next-space = Next Space
 zen-action-previous-space = Previous Space
 zen-action-close-tab = Close Tab
+zen-action-reopen-closed-tab = Reopen Closed Tab
+zen-action-duplicate-tab = Duplicate Current Tab
+zen-action-reset-pinned-tab = Reset Pinned Tab
 zen-action-reload-tab = Reload Tab
 zen-action-reload-tab-without-cache = Reload Tab Without Cache
 zen-action-next-tab = Next Tab
@@ -34,3 +39,4 @@ zen-action-switch-to-dark-mode = Switch to Dark Mode
 zen-action-print = Print
 zen-action-focus-on = Focus on
 zen-action-extension = Extension
+zen-action-open = Open

locales/en-US/browser/browser/zen-library.ftl

@@ -0,0 +1,112 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+zen-library-button =
+    .label = Library
+    .tooltiptext = Library
+
+library-footer-close-button =
+    .tooltiptext = Close library
+library-footer-donate-button =
+    .tooltiptext = Donate to Zen
+
+library-history-section-title = History
+library-downloads-section-title = Downloads
+library-boosts-section-title = Boosts
+library-media-section-title = Media
+library-spaces-section-title = Spaces
+
+library-filter-button = Filter
+library-filter-done = Done
+
+library-history-filter-title = Filter History…
+library-history-filter-when = When was it visited?
+library-filter-today = Today
+library-filter-week = This Week
+library-filter-month = This Month
+library-history-filter-sort = Sort by
+library-history-sort-date = By Date
+library-history-sort-site = By Site
+library-history-sort-most-visited = By Most Visited
+library-history-sort-last-visited = By Last Visited
+library-history-site-other = Other
+library-history-search-placeholder =
+    .placeholder = Search History…
+library-history-empty = No history found
+library-media-empty = No media found
+library-media-search-placeholder =
+    .placeholder = Search Media…
+library-media-loading = Looking for media…
+library-media-opt-in-title = Your Media in the Library
+library-media-opt-in-body = Quickly grab screenshots, images and videos from your computer by showing them in the Zen Library.
+library-media-opt-in-button = Show Media
+library-media-opt-in-note = Media never leaves your computer and is not viewable by anyone but you.
+library-media-filter-title = Filter Media…
+library-media-filter-folders = Where to look
+library-media-open-in = Open in { $app }
+library-media-close =
+    .title = Close
+library-media-previous =
+    .title = Previous
+library-media-next =
+    .title = Next
+library-media-more =
+    .title = More options
+library-media-menu-open =
+    .label = Open
+library-media-menu-copy =
+    .label = Copy
+library-history-forget-button =
+    .title = Remove from history
+library-history-reopen-button =
+    .title = Reopen page
+
+library-downloads-empty = No downloads found
+library-downloads-more-button =
+    .title = More options
+library-downloads-menu-open =
+    .label = Open { $name }
+library-downloads-menu-copy =
+    .label = Copy { $name }
+library-downloads-menu-hide =
+    .label = Hide from Zen
+library-downloads-menu-trash =
+    .label = Move to Trash
+library-downloads-opening-in = { PLATFORM() ->
+    [macos] Opening in Finder…
+    [windows] Opening in File Explorer…
+   *[other] Opening in file manager…
+}
+library-downloads-cancel-button =
+    .title = Cancel download
+library-downloads-filter-title = Filter Downloads…
+library-downloads-filter-type = File type
+library-downloads-filter-when = When was it downloaded?
+library-downloads-type-images = Images
+library-downloads-type-video = Video
+library-downloads-type-audio = Audio
+library-downloads-type-documents = Documents
+library-downloads-type-archives = Archives
+library-downloads-type-apps = Apps
+library-downloads-retry-button =
+    .title = Retry download
+
+library-spaces-theme-button =
+    .title = Change theme
+library-spaces-move-button =
+    .title = Drag to reorder
+library-spaces-actions-button =
+    .tooltiptext = More options
+library-spaces-icon-button =
+    .title = Change icon
+library-spaces-name-button =
+    .title = Rename space
+
+library-boosts-search-placeholder =
+    .placeholder = Search Boosts…
+library-boosts-empty = No boosts yet
+library-boosts-toggle =
+    .aria-label = Enable boost
+library-boosts-menu-edit =
+    .label = Edit Boost

locales/en-US/browser/browser/zen-share.ftl

@@ -0,0 +1,43 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+zen-share-space =
+    .label = Share Space…
+zen-share-folder =
+    .label = Share Folder…
+zen-share-split-view =
+    .label = Share Split View…
+
+zen-share-link-copied-toast = Share link copied!
+zen-share-link-expires-description = Anyone with the link can open it until { $date }
+zen-share-link-permanent-description = Anyone with the link can open it
+
+zen-share-error-toast = Couldn't create a share link
+zen-share-error-auth-description = The share server rejected your key
+zen-share-error-too-large-description = This share is too big to upload
+zen-share-error-rate-limited-description = You're sharing too fast, try again in a minute
+zen-share-error-network-description = Couldn't reach the share server
+zen-share-error-empty-description = There's nothing shareable here
+zen-share-error-server-description = The share server returned an error
+
+zen-share-overlay-loading = Loading shared tabs…
+zen-share-overlay-from-space = A Space from { $name }
+zen-share-overlay-from-folder = A Folder from { $name }
+zen-share-overlay-shared-with-you = Shared with you
+zen-share-overlay-add-space = Add Space to Zen
+zen-share-overlay-add-folder = Add Folder to Zen
+zen-share-imported-toast = Added to your browser!
+zen-share-import-error-toast = Couldn't import this share
+zen-share-import-error-dead-description = The link has expired or doesn't exist
+zen-share-import-error-invalid-description = The shared data is invalid
+
+zen-share-confirm-title = Share link
+zen-share-confirm-dialog =
+    .buttonlabelaccept = Share
+zen-share-confirm-description = Zen uploads a copy of these tabs to the share server and copies a link anyone can open. The link expires after 30 days.
+zen-share-confirm-anonymous = Sharing is anonymous unless you add a name.
+zen-share-confirm-name-input =
+    .placeholder = Your name (optional)
+zen-share-confirm-dont-ask =
+    .label = Don't ask me again

locales/en-US/browser/browser/zen-welcome.ftl

@@ -5,29 +5,33 @@
 zen-welcome-title-line1 = Welcome to
 zen-welcome-title-line2 = a calmer internet
 
-zen-welcome-import-title = A Fresh Start, Same Bookmarks
-zen-welcome-import-description-1 = Your bookmarks, history, and passwords are like a trail of breadcrumbs through the internet—don’t leave them behind!
-zen-welcome-import-description-2 = Easily bring them over from another browser and pick up right where you left off.
-zen-welcome-import-button = Import now
+zen-welcome-back = Back
+zen-welcome-skip = Skip for now
 
-zen-welcome-set-default-browser = Set { -brand-short-name } as your default browser
-zen-welcome-dont-set-default-browser = DON’T set { -brand-short-name } as your default browser
+zen-welcome-import-title = Bring your stuff along.
+zen-welcome-import-description = Import your bookmarks, history and passwords from another browser and pick up right where you left off.
+zen-welcome-import-yes = <strong>YES</strong>, import from another browser.
+zen-welcome-import-no = <strong>NO</strong>, start fresh.
 
-zen-welcome-initial-essentials-title = Your Key Tabs, Always Within Reach
-zen-welcome-initial-essentials-description-1 = Keep your most important tabs easily accessible and always at hand, no matter how many you open.
-zen-welcome-initial-essentials-description-2 = Essential tabs are always visible, no matter what workspace you are in.
+zen-welcome-default-browser-title = Make { -brand-short-name } your default?
+zen-welcome-default-browser-description = Links from other apps will open in { -brand-short-name }. You can always change this later.
+zen-welcome-set-default-browser = <strong>YES</strong>, make { -brand-short-name } default.
+zen-welcome-dont-set-default-browser = <strong>NO</strong>, still exploring my options.
 
-zen-welcome-workspace-colors-title = Your Workspaces, Your Colors
-zen-welcome-workspace-colors-description = Personalize your browser by giving each workspace its own unique color identity.
-
-zen-welcome-start-browsing-title = All set?<br/>
-    Let’s get rolling!
-zen-welcome-start-browsing-description-1 = You’re all set up and ready to go. Click the button below to start browsing with { -brand-short-name }.
-zen-welcome-start-browsing = Dive in!
-
-zen-welcome-default-search-title = Your Default Search Engine
+zen-welcome-default-search-title = Pick your search engine.
 zen-welcome-default-search-description = Choose your default search engine. You can always change it later!
 
-zen-welcome-skip-button = Skip
+zen-welcome-essentials-title = Choose the apps you use most.
+zen-welcome-essentials-description = Select your favorite apps to keep them handy in your sidebar.
 
-zen-welcome-finished = Your Zen has been set up correctly!
+zen-welcome-block-ads-title = Block ads and trackers?
+zen-welcome-block-ads-description = { -brand-short-name } can install uBlock Origin for you, so pages load cleaner and faster. You can remove it any time.
+zen-welcome-block-ads-yes = <strong>YES</strong>, block ads for me.
+zen-welcome-block-ads-no = <strong>NO</strong>, show me everything.
+
+zen-welcome-workspace-colors-title = Your space, your colors.
+zen-welcome-workspace-colors-description = Personalize your browser by giving each space its own unique color identity.
+
+zen-welcome-start-browsing-title = All set? Let’s get rolling!
+zen-welcome-start-browsing-description-1 = You’re all set up and ready to go. Click the button below to start browsing with { -brand-short-name }.
+zen-welcome-start-browsing = Dive in!

package-lock.json

@@ -11,7 +11,7 @@
       "devDependencies": {
         "@babel/preset-typescript": "^7.27.0",
         "@zen-browser/prettier": "^3.9.3",
-        "@zen-browser/surfer": "^1.14.8",
+        "@zen-browser/surfer": "^1.14.9",
         "formal-git": "^1.2.9",
         "globals": "^16.3.0",
         "husky": "^9.1.7",
@@ -860,9 +860,9 @@
       }
     },
     "node_modules/@zen-browser/surfer": {
-      "version": "1.14.8",
-      "resolved": "https://registry.npmjs.org/@zen-browser/surfer/-/surfer-1.14.8.tgz",
-      "integrity": "sha512-5HHcfibwHIK5n3huhJL2TLBX2+8odj6ebCMA6U2EcUj9ROSrcz7/bjY2n5MIa9oIRL9gtV3ott0jwJj6SlapxA==",
+      "version": "1.14.9",
+      "resolved": "https://registry.npmjs.org/@zen-browser/surfer/-/surfer-1.14.9.tgz",
+      "integrity": "sha512-XbMzG4GHSRoGzKR/DkpyywcbTYemieDRD1A6qgJ8CaVDixenj/uzMhp6HXAUksRTeh1u9j3lzNcVrI99axcZLw==",
       "dev": true,
       "license": "MPL-2.0",
       "dependencies": {

package.json

@@ -49,7 +49,7 @@
   "devDependencies": {
     "@babel/preset-typescript": "^7.27.0",
     "@zen-browser/prettier": "^3.9.3",
-    "@zen-browser/surfer": "^1.14.8",
+    "@zen-browser/surfer": "^1.14.9",
     "formal-git": "^1.2.9",
     "globals": "^16.3.0",
     "husky": "^9.1.7",

prefs/zen/library.yaml

@@ -0,0 +1,15 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+- name: zen.library.enabled
+  value: "@IS_TWILIGHT@"
+
+- name: zen.library.last-tab
+  value: "history"
+
+- name: zen.library.media.enabled
+  value: false
+
+- name: zen.library.media.folders
+  value: "downloads,documents,pictures"

prefs/zen/share.yaml

@@ -2,5 +2,18 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-- name: zen.share.enabled
+- name: zen.share.base-url
+  value: "https://share.zen-browser.app"
+
+- name: zen.share.secret-key
+  value: ""
+
+- name: zen.share.display-name
+  value: ""
+
+# Allow zen.share.display-name to be synced across devices.
+- name: services.sync.prefs.sync.zen.share.display-name
   value: true
+
+- name: zen.share.dont-ask-before-sharing
+  value: false

prefs/zen/sync.yaml

@@ -3,13 +3,14 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 - name: services.sync.engine.spaces
-  value: true
+  value: "@cond"
   condition: "@IS_TWILIGHT@"
 
-- name: services.sync.engine.spaces
-  value: false
-  locked: true
-  condition: "!@IS_TWILIGHT@"
-
 - name: zen.spaces-sync.debug
   value: false
+
+- name: zen.spaces-sync.normal-tabs
+  value: false
+
+- name: services.sync.prefs.sync.zen.spaces-sync.normal-tabs
+  value: true

prefs/zen/theme.yaml

@@ -20,6 +20,7 @@
 - name: zen.theme.acrylic-elements
   value: "@IS_TWILIGHT@"
 
+
 - name: zen.theme.disable-lightweight
   value: true
 

src/-stylelintignore.patch

@@ -1,8 +1,8 @@
 diff --git a/.stylelintignore b/.stylelintignore
-index 185490999507b8a5032977237af50f5e61c71df1..77c1635d90c6480af4ebd3c6e3ec49780eaca571 100644
+index 185490999507b8a5032977237af50f5e61c71df1..4b1b1dc76d316f38f60c90e6cbd74d9569800d04 100644
 --- a/.stylelintignore
 +++ b/.stylelintignore
-@@ -106,3 +106,19 @@ build/pgo/blueprint/**/*.css
+@@ -106,3 +106,20 @@ build/pgo/blueprint/**/*.css
  # under our control or we don't want to modify at this point:
  testing/web-platform/mozilla/
  testing/web-platform/tests/
@@ -20,5 +20,6 @@ index 185490999507b8a5032977237af50f5e61c71df1..77c1635d90c6480af4ebd3c6e3ec4978
 +zen/split-view/zen-split-view.css
 +zen/spaces/zen-workspaces.css
 +zen/common/styles/zen-toolbar.css
++zen/common/styles/zen-single-components.css
 +
 +*.inc

src/-stylelintrc-js.patch

@@ -1,5 +1,5 @@
 diff --git a/.stylelintrc.js b/.stylelintrc.js
-index b484bf6600a7e1b8ad2aed8c8b7fe5e84cc3d023..f89712e2c13dfa0bcb48e55cd3872c67f5c98dad 100644
+index b5f8245fa04ffb8fc82240261d63f893f4629f19..1b6ead24adbe69fcb5aeb95cfd3e7fa9662d89d8 100644
 --- a/.stylelintrc.js
 +++ b/.stylelintrc.js
 @@ -67,7 +67,7 @@ module.exports = {
@@ -11,10 +11,10 @@ index b484bf6600a7e1b8ad2aed8c8b7fe5e84cc3d023..f89712e2c13dfa0bcb48e55cd3872c67
        {
          ignore: ["blockless-at-rules"],
        },
-@@ -280,7 +280,7 @@ module.exports = {
-     "media-query-no-invalid": null,
+@@ -281,7 +281,7 @@ module.exports = {
      "stylelint-plugin-mozilla/media-query-no-invalid": true,
      "stylelint-plugin-mozilla/no-base-design-tokens": true,
+     "stylelint-plugin-mozilla/no-has-selector": true,
 -    "stylelint-plugin-mozilla/use-design-tokens": true,
 +    "stylelint-plugin-mozilla/use-design-tokens": false,
    },

src/browser/base/content/navigator-toolbox-inc-xhtml.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/base/content/navigator-toolbox.inc.xhtml b/browser/base/content/navigator-toolbox.inc.xhtml
-index dd2f391096968564086911c532f696dc7ffb8ae1..c968e5f0ebb5f0151fb124bafe10d8d5361e060f 100644
+index a76bb7aae7636c07989a4acb35281777d3103505..d35aa0457307e95ad00464861fcee2827325193e 100644
 --- a/browser/base/content/navigator-toolbox.inc.xhtml
 +++ b/browser/base/content/navigator-toolbox.inc.xhtml
 @@ -2,7 +2,7 @@
@@ -26,7 +26,7 @@ index dd2f391096968564086911c532f696dc7ffb8ae1..c968e5f0ebb5f0151fb124bafe10d8d5
    <toolbar id="TabsToolbar"
             class="browser-toolbar browser-titlebar"
             fullscreentoolbar="true"
-@@ -54,6 +58,8 @@
+@@ -56,6 +60,8 @@
            <html:sidebar-pins-promo id="drag-to-pin-promo-card"></html:sidebar-pins-promo>
            <arrowscrollbox id="pinned-tabs-container" orient="horizontal" clicktoscroll=""></arrowscrollbox>
            <splitter orient="vertical" id="vertical-pinned-tabs-splitter" resizebefore="sibling" resizeafter="none" hidden="true"/>
@@ -35,7 +35,7 @@ index dd2f391096968564086911c532f696dc7ffb8ae1..c968e5f0ebb5f0151fb124bafe10d8d5
            <hbox class="tab-drop-indicator" hidden="true"/>
            <arrowscrollbox id="tabbrowser-arrowscrollbox" orient="horizontal" flex="1" clicktoscroll="" scrolledtostart="" scrolledtoend="">
              <tab is="tabbrowser-tab" class="tabbrowser-tab" selected="" visuallyselected="" fadein=""/>
-@@ -73,6 +79,7 @@
+@@ -75,6 +81,7 @@
                                tooltip="dynamic-shortcut-tooltip"
                                data-l10n-id="tabs-toolbar-new-tab"/>
            <html:span id="tabbrowser-tab-a11y-desc" hidden="true"/>
@@ -43,7 +43,7 @@ index dd2f391096968564086911c532f696dc7ffb8ae1..c968e5f0ebb5f0151fb124bafe10d8d5
          </tabs>
  
          <toolbarbutton id="new-tab-button"
-@@ -99,9 +106,10 @@
+@@ -102,9 +109,10 @@
  
      <toolbarbutton class="content-analysis-indicator toolbarbutton-1 content-analysis-indicator-icon"/>
  
@@ -54,4 +54,12 @@ index dd2f391096968564086911c532f696dc7ffb8ae1..c968e5f0ebb5f0151fb124bafe10d8d5
 +</hbox>
  
    <toolbar id="nav-bar"
-            class="browser-toolbar chromeclass-location"
+            class="browser-toolbar"
+@@ -180,7 +188,6 @@
+         <toolbartabstop/>
+         <html:moz-urlbar id="urlbar"
+               class="urlbar"
+-              popover="manual"
+               pageproxystate="invalid"
+               unifiedsearchbutton-available=""
+               sap-name="urlbar">

src/browser/base/content/zen-assets.jar.inc.mn

@@ -21,3 +21,5 @@
 #include ../../../zen/boosts/jar.inc.mn
 #include ../../../zen/live-folders/jar.inc.mn
 #include ../../../zen/space-routing/jar.inc.mn
+#include ../../../zen/share/jar.inc.mn
+#include ../../../zen/library/jar.inc.mn

src/browser/base/content/zen-commands.inc.xhtml

@@ -16,6 +16,7 @@
   <command id="cmd_zenSplitViewUnsplit" />
   <command id="cmd_zenSplitViewLinkInNewTab" />
   <command id="cmd_zenSplitViewContextMenu" />
+  <command id="cmd_zenCtxShareSplitView" />
   <command id="cmd_zenNewEmptySplit" />
 
   <!-- Workspace commands -->
@@ -40,6 +41,7 @@
   <command id="cmd_contextZenRemoveFromEssentials" />
 
   <command id="cmd_zenCtxDeleteWorkspace" />
+  <command id="cmd_zenCtxShareWorkspace" />
   <command id="cmd_zenUnloadWorkspace" />
   <command id="cmd_zenUnloadAllOtherWorkspace" />
   <command id="cmd_zenOpenSpaceRoutingSettings" />
@@ -70,4 +72,6 @@
   <command id="cmd_zenNewLiveFolder" />
 
   <command id="cmd_zenDuplicateTab" />
+
+  <command id="cmd_zenToggleLibrary" />
 </commandset>

src/browser/base/content/zen-locales.inc.xhtml

@@ -12,4 +12,6 @@
 <link rel="localization" href="browser/zen-boosts.ftl"/>
 <link rel="localization" href="browser/zen-live-folders.ftl"/>
 <link rel="localization" href="browser/zen-space-routing.ftl"/>
+<link rel="localization" href="browser/zen-share.ftl"/>
+<link rel="localization" href="browser/zen-library.ftl"/>
 </linkset>

src/browser/base/content/zen-panels/popups.inc

@@ -32,6 +32,7 @@
   <menuitem id="context_zenUnloadAllOtherWorkspace" data-l10n-id="zen-workspaces-panel-unload-others" command="cmd_zenUnloadAllOtherWorkspace"/>
   <menuseparator/>
   <menuitem data-l10n-id="zen-panel-ui-workspaces-create" command="cmd_zenOpenWorkspaceCreation"/>
+  <menuitem id="context_zenShareWorkspace" data-l10n-id="zen-share-space" command="cmd_zenCtxShareWorkspace"/>
   <menuitem id="context_zenDeleteWorkspace" data-l10n-id="zen-workspaces-panel-context-delete" command="cmd_zenCtxDeleteWorkspace"/>
   <menuseparator/>
   <menuitem id="context_zenSpaceRoutingSettings" data-l10n-id="zen-space-routing-settings" command="cmd_zenOpenSpaceRoutingSettings"/>
@@ -55,6 +56,7 @@
     <menupopup />
   </menu>
   <menuitem id="context_zenFolderToSpace" data-l10n-id="zen-folders-panel-convert-folder-to-space" />
+  <menuitem id="context_zenShareFolder" data-l10n-id="zen-share-folder"/>
   <menuseparator />
   <menuitem id="context_zenFolderUnpack" data-l10n-id="zen-folders-panel-unpack-folder"/>
   <menuitem id="context_zenFolderDelete" data-l10n-id="zen-folders-panel-delete-folder"/>

src/browser/base/content/zen-panels/theme-picker.inc

@@ -14,14 +14,14 @@
     <panelview id="PanelUI-zen-gradient-generator-view" class="PanelUI-subView zen-theme-picker" role="document" mainview-with-header="true" has-custom-header="true">
       <hbox class="zen-theme-picker-gradient">
         <hbox id="PanelUI-zen-gradient-generator-scheme">
-          <button id="PanelUI-zen-gradient-generator-scheme-auto" class="subviewbutton"/>
-          <button id="PanelUI-zen-gradient-generator-scheme-light" class="subviewbutton"/>
-          <button id="PanelUI-zen-gradient-generator-scheme-dark" class="subviewbutton"/> 
+          <button id="PanelUI-zen-gradient-generator-scheme-auto" class="no-squircles subviewbutton"/>
+          <button id="PanelUI-zen-gradient-generator-scheme-light" class="no-squircles subviewbutton"/>
+          <button id="PanelUI-zen-gradient-generator-scheme-dark" class="no-squircles subviewbutton"/> 
         </hbox>
         <hbox id="PanelUI-zen-gradient-generator-color-actions">
-          <button id="PanelUI-zen-gradient-generator-color-add" class="subviewbutton" />
-          <button id="PanelUI-zen-gradient-generator-color-remove" class="subviewbutton" />
-          <button id="PanelUI-zen-gradient-generator-color-toggle-algo" class="subviewbutton" />
+          <button id="PanelUI-zen-gradient-generator-color-add" class="no-squircles subviewbutton" />
+          <button id="PanelUI-zen-gradient-generator-color-remove" class="no-squircles subviewbutton" />
+          <button id="PanelUI-zen-gradient-generator-color-toggle-algo" class="no-squircles subviewbutton" />
         </hbox>
         <label data-l10n-id="zen-panel-ui-gradient-click-to-add" id="PanelUI-zen-gradient-generator-color-click-to-add"></label>
       </hbox>
@@ -29,82 +29,82 @@
         <toolbarbutton id="PanelUI-zen-gradient-generator-color-page-left" class="toolbarbutton-1" disabled="true" />
         <hbox id="PanelUI-zen-gradient-generator-color-pages">
           <hbox>
-            <box data-lightness="90" data-algo="float" data-num-dots="1" data-position="240,240" style="background: #f4efdf;"></box>
-            <box data-lightness="80" data-algo="float" data-num-dots="1" data-position="233,157" style="background: #f0b8cd;"></box>
-            <box data-lightness="80" data-algo="float" data-num-dots="1" data-position="236,111" style="background: #e9c3e3;"></box>
-            <box data-lightness="70" data-algo="float" data-num-dots="1" data-position="234,173" style="background: #da7682;"></box>
-            <box data-lightness="70" data-algo="float" data-num-dots="1" data-position="220,187" style="background: #eb8570;"></box>
-            <box data-lightness="60" data-algo="float" data-num-dots="1" data-position="225,237" style="background: #dcce7f;"></box>
-            <box data-lightness="60" data-algo="float" data-num-dots="1" data-position="147,195" style="background: #5becad;"></box>
-            <box data-lightness="50" data-algo="float" data-num-dots="1" data-position="81,84" style="background: #919bb5;"></box>
+            <box class="no-squircles" data-lightness="90" data-algo="float" data-num-dots="1" data-position="240,240" style="background: #f4efdf;"></box>
+            <box class="no-squircles" data-lightness="80" data-algo="float" data-num-dots="1" data-position="233,157" style="background: #f0b8cd;"></box>
+            <box class="no-squircles" data-lightness="80" data-algo="float" data-num-dots="1" data-position="236,111" style="background: #e9c3e3;"></box>
+            <box class="no-squircles" data-lightness="70" data-algo="float" data-num-dots="1" data-position="234,173" style="background: #da7682;"></box>
+            <box class="no-squircles" data-lightness="70" data-algo="float" data-num-dots="1" data-position="220,187" style="background: #eb8570;"></box>
+            <box class="no-squircles" data-lightness="60" data-algo="float" data-num-dots="1" data-position="225,237" style="background: #dcce7f;"></box>
+            <box class="no-squircles" data-lightness="60" data-algo="float" data-num-dots="1" data-position="147,195" style="background: #5becad;"></box>
+            <box class="no-squircles" data-lightness="50" data-algo="float" data-num-dots="1" data-position="81,84" style="background: #919bb5;"></box>
           </hbox>
           <hbox>
-            <box data-lightness="90" data-algo="analogous" data-num-dots="3" data-position="240,240"
+            <box class="no-squircles" data-lightness="90" data-algo="analogous" data-num-dots="3" data-position="240,240"
                 style="--c1: rgb(245, 237, 214); --c2: rgb(221, 243, 216); --c3: rgb(243, 216, 225);" />
-            <box data-lightness="85" data-algo="analogous" data-num-dots="3" data-position="233,157"
+            <box class="no-squircles" data-lightness="85" data-algo="analogous" data-num-dots="3" data-position="233,157"
                 style="--c1: rgb(243, 190, 222); --c2: rgb(247, 222, 186); --c3: rgb(223, 195, 238);" />
-            <box data-lightness="80" data-algo="analogous" data-num-dots="3" data-position="236,111"
+            <box class="no-squircles" data-lightness="80" data-algo="analogous" data-num-dots="3" data-position="236,111"
                 style="--c1: rgb(229, 179, 228); --c2: rgb(236, 172, 178); --c3: rgb(197, 185, 223);" />
-            <box data-lightness="70" data-algo="analogous" data-num-dots="3" data-position="234,173"
+            <box class="no-squircles" data-lightness="70" data-algo="analogous" data-num-dots="3" data-position="234,173"
                 style="--c1: rgb(235, 122, 159); --c2: rgb(239, 239, 118); --c3: rgb(210, 133, 224);" />
-            <box data-lightness="70" data-algo="analogous" data-num-dots="3" data-position="220,187"
+            <box class="no-squircles" data-lightness="70" data-algo="analogous" data-num-dots="3" data-position="220,187"
                 style="--c1: rgb(242, 115, 123); --c2: rgb(175, 242, 115); --c3: rgb(230, 125, 232);" />
-            <box data-lightness="60" data-algo="analogous" data-num-dots="3" data-position="225,237"
+            <box class="no-squircles" data-lightness="60" data-algo="analogous" data-num-dots="3" data-position="225,237"
                 style="--c1: rgb(221, 205, 85); --c2: rgb(97, 212, 94); --c3: rgb(215, 91, 124);" />
-            <box data-lightness="60" data-algo="analogous" data-num-dots="3" data-position="147,195"
+            <box class="no-squircles" data-lightness="60" data-algo="analogous" data-num-dots="3" data-position="147,195"
                 style="--c1: rgb(75, 231, 210); --c2: rgb(84, 175, 222); --c3: rgb(62, 244, 112);" />
-            <box data-lightness="55" data-algo="analogous" data-num-dots="3" data-position="81,84"
+            <box class="no-squircles" data-lightness="55" data-algo="analogous" data-num-dots="3" data-position="81,84"
                 style="--c1: rgb(122, 132, 158); --c2: rgb(137, 117, 164); --c3: rgb(116, 162, 164);" />
           </hbox>
           <hbox>
-            <box data-lightness="10" data-algo="float" data-num-dots="1" data-position="171,72" style="background:rgb(93, 86, 106);"></box>
-            <box data-lightness="40" data-algo="float" data-num-dots="1" data-position="265,79" style="background: #997096;"></box>
-            <box data-lightness="35" data-algo="float" data-num-dots="1" data-position="301,176" style="background: #956066;"></box>
-            <box data-lightness="30" data-algo="float" data-num-dots="1" data-position="237,210" style="background: #9c6645;"></box>
-            <box data-lightness="30" data-algo="float" data-num-dots="1" data-position="91,228" style="background: #517b6c;"></box>
-            <box data-lightness="25" data-algo="float" data-num-dots="1" data-position="67,159" style="background: #576e75;"></box>
-            <box data-lightness="20" data-algo="float" data-num-dots="1" data-position="314,235" style="background:rgb(131, 109, 95);"></box>
-            <box data-lightness="20" data-algo="float" data-num-dots="1" data-position="118,215" style="background: #447464;"></box>
+            <box class="no-squircles" data-lightness="10" data-algo="float" data-num-dots="1" data-position="171,72" style="background:rgb(93, 86, 106);"></box>
+            <box class="no-squircles" data-lightness="40" data-algo="float" data-num-dots="1" data-position="265,79" style="background: #997096;"></box>
+            <box class="no-squircles" data-lightness="35" data-algo="float" data-num-dots="1" data-position="301,176" style="background: #956066;"></box>
+            <box class="no-squircles" data-lightness="30" data-algo="float" data-num-dots="1" data-position="237,210" style="background: #9c6645;"></box>
+            <box class="no-squircles" data-lightness="30" data-algo="float" data-num-dots="1" data-position="91,228" style="background: #517b6c;"></box>
+            <box class="no-squircles" data-lightness="25" data-algo="float" data-num-dots="1" data-position="67,159" style="background: #576e75;"></box>
+            <box class="no-squircles" data-lightness="20" data-algo="float" data-num-dots="1" data-position="314,235" style="background:rgb(131, 109, 95);"></box>
+            <box class="no-squircles" data-lightness="20" data-algo="float" data-num-dots="1" data-position="118,215" style="background: #447464;"></box>
           </hbox>
           <hbox>
-            <box data-lightness="10" data-algo="analogous" data-num-dots="3" data-position="171,72"
+            <box class="no-squircles" data-lightness="10" data-algo="analogous" data-num-dots="3" data-position="171,72"
                 style="--c1: rgb(23, 17, 34); --c2: rgb(37, 14, 35); --c3: rgb(18, 22, 33);" />
-            <box data-lightness="40" data-algo="analogous" data-num-dots="3" data-position="265,79"
+            <box class="no-squircles" data-lightness="40" data-algo="analogous" data-num-dots="3" data-position="265,79"
                 style="--c1: rgb(128, 76, 124); --c2: rgb(141, 63, 66); --c3: rgb(97, 88, 116);" />
-            <box data-lightness="35" data-algo="analogous" data-num-dots="3" data-position="301,176"
+            <box class="no-squircles" data-lightness="35" data-algo="analogous" data-num-dots="3" data-position="301,176"
                 style="--c1: rgb(122, 56, 64); --c2: rgb(126, 121, 52); --c3: rgb(111, 68, 110);" />
-            <box data-lightness="30" data-algo="analogous" data-num-dots="3" data-position="237,210"
+            <box class="no-squircles" data-lightness="30" data-algo="analogous" data-num-dots="3" data-position="237,210"
                 style="--c1: rgb(131, 65, 22); --c2: rgb(64, 128, 25); --c3: rgb(122, 31, 91);" />
-            <box data-lightness="30" data-algo="analogous" data-num-dots="3" data-position="91,228"
+            <box class="no-squircles" data-lightness="30" data-algo="analogous" data-num-dots="3" data-position="91,228"
                 style="--c1: rgb(45, 108, 85); --c2: rgb(52, 85, 101); --c3: rgb(52, 118, 35);" />
-            <box data-lightness="25" data-algo="analogous" data-num-dots="3" data-position="67,159"
+            <box class="no-squircles" data-lightness="25" data-algo="analogous" data-num-dots="3" data-position="67,159"
                 style="--c1: rgb(45, 74, 83); --c2: rgb(46, 50, 81); --c3: rgb(38, 90, 65);" />
-            <box data-lightness="20" data-algo="analogous" data-num-dots="3" data-position="314,235"
+            <box class="no-squircles" data-lightness="20" data-algo="analogous" data-num-dots="3" data-position="314,235"
                 style="--c1: rgb(64, 47, 38); --c2: rgb(55, 64, 38); --c3: rgb(59, 43, 52);" />
-            <box data-lightness="20" data-algo="analogous" data-num-dots="3" data-position="118,215"
+            <box class="no-squircles" data-lightness="20" data-algo="analogous" data-num-dots="3" data-position="118,215"
                 style="--c1: rgb(22, 80, 61); --c2: rgb(26, 60, 76); --c3: rgb(27, 87, 15);" />
           </hbox>
           <hbox>
 # Start from black to white in a span on 8 steps and.
 # They must all go from the middle to the right side. They must always stay verically centered.
 # And reach to 180 on the right side, meaning we must divide the width in 16 segments.
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="340,180" style="background: rgb(224, 224, 224);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="337.5,180" style="background: rgb(224, 224, 224);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="315,180" style="background: rgb(192, 192, 192);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="292.5,180" style="background: rgb(160, 160, 160);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="270,180" style="background: rgb(128, 128, 128);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="247.5,180" style="background: rgb(96, 96, 96);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="225,180" style="background: rgb(64, 64, 64);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="202.5,180" style="background: rgb(32, 32, 32);"></box>
-            <box data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
+            <box class="no-squircles" data-type="explicit-black-white" data-algo="float" data-num-dots="1" 
                 data-position="180,180" style="background: rgb(0, 0, 0);"></box>
           </hbox>
         </hbox>

src/browser/components/contextualidentity/content/ContainerCreationPanel-mjs.patch

@@ -0,0 +1,21 @@
+diff --git a/browser/components/contextualidentity/content/ContainerCreationPanel.mjs b/browser/components/contextualidentity/content/ContainerCreationPanel.mjs
+index e04d7a4738192703e8f7f8555f50aaf0a619a5bd..b86e4853c421856f84ad8e017062f0d611b88aad 100644
+--- a/browser/components/contextualidentity/content/ContainerCreationPanel.mjs
++++ b/browser/components/contextualidentity/content/ContainerCreationPanel.mjs
+@@ -4,7 +4,7 @@
+ 
+ import { ContainerEditor } from "chrome://browser/content/usercontext/ContainerEditor.mjs";
+ 
+-const ANCHOR_ID = "userContext-icons";
++const ANCHOR_ID = "navigator-toolbox";
+ const ANCHOR_PINNED_CLASS = "container-anchor-pinned";
+ 
+ const lazy = {};
+@@ -95,6 +95,6 @@ export const ContainerCreationPanel = {
+       anchor.hidden = false;
+     }
+ 
+-    panel.openPopup(anchor, "bottomright topright");
++    panel.openPopup(anchor, win.gZenUIManager.panelUIPosition());
+   },
+ };

src/browser/components/customizableui/CustomizableUI-sys-mjs.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/components/customizableui/CustomizableUI.sys.mjs b/browser/components/customizableui/CustomizableUI.sys.mjs
-index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2681652e5 100644
+index 875f8b03d979353ef44a57c15ef1ae09d33ab730..3d6e092e7ed126cdee8c32229df2cfa13303d3a3 100644
 --- a/browser/components/customizableui/CustomizableUI.sys.mjs
 +++ b/browser/components/customizableui/CustomizableUI.sys.mjs
 @@ -13,6 +13,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
@@ -10,7 +10,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
    HomePage: "resource:///modules/HomePage.sys.mjs",
    PanelMultiView:
      "moz-src:///browser/components/customizableui/PanelMultiView.sys.mjs",
-@@ -348,7 +349,7 @@ var CustomizableUIInternal = {
+@@ -352,7 +353,7 @@ var CustomizableUIInternal = {
        {
          type: CustomizableUI.TYPE_PANEL,
          defaultPlacements: [],
@@ -19,7 +19,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
        },
        false
      );
-@@ -358,27 +359,23 @@ var CustomizableUIInternal = {
+@@ -362,20 +363,15 @@ var CustomizableUIInternal = {
        "back-button",
        "forward-button",
        "stop-reload-button",
@@ -41,26 +41,29 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      this.registerArea(
        CustomizableUI.AREA_NAVBAR,
        {
-         type: CustomizableUI.TYPE_TOOLBAR,
+@@ -383,9 +379,6 @@ var CustomizableUIInternal = {
          overflowable: true,
          defaultPlacements: navbarPlacements,
--        verticalTabsDefaultPlacements: ["alltabs-button", "ai-window-toggle"],
-+        verticalTabsDefaultPlacements: [
-+        ],
+         verticalTabsDefaultPlacements: [
+-          "alltabs-button",
+-          "smartwindow-group-tabs-button",
+-          "ai-window-toggle",
+         ],
          defaultCollapsed: false,
        },
-       true
-@@ -402,9 +399,6 @@ var CustomizableUIInternal = {
+@@ -410,11 +403,6 @@ var CustomizableUIInternal = {
          type: CustomizableUI.TYPE_TOOLBAR,
          defaultPlacements: [
            "tabbrowser-tabs",
 -          "new-tab-button",
+-          "spring",
 -          "alltabs-button",
+-          "smartwindow-group-tabs-button",
 -          "ai-window-toggle",
          ],
          verticalTabsDefaultPlacements: [],
          defaultCollapsed: null,
-@@ -484,6 +478,7 @@ var CustomizableUIInternal = {
+@@ -507,6 +495,7 @@ var CustomizableUIInternal = {
        CustomizableUI.AREA_NAVBAR,
        CustomizableUI.AREA_BOOKMARKS,
        CustomizableUI.AREA_TABSTRIP,
@@ -68,7 +71,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      ]);
      if (AppConstants.platform != "macosx") {
        toolbars.add(CustomizableUI.AREA_MENUBAR);
-@@ -1285,6 +1280,9 @@ var CustomizableUIInternal = {
+@@ -1339,6 +1328,9 @@ var CustomizableUIInternal = {
          placements = gPlacements.get(area);
        }
  
@@ -78,7 +81,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
        // For toolbars that need it, mark as dirty.
        let defaultPlacements = areaProperties.get("defaultPlacements");
        if (
-@@ -1793,7 +1791,6 @@ var CustomizableUIInternal = {
+@@ -1847,7 +1839,6 @@ var CustomizableUIInternal = {
          lazy.log.info(
            "Widget " + aWidgetId + " not found, unable to remove from " + aArea
          );
@@ -86,7 +89,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
        }
  
        this.notifyDOMChange(widgetNode, null, container, true, () => {
-@@ -1803,7 +1800,7 @@ var CustomizableUIInternal = {
+@@ -1857,7 +1848,7 @@ var CustomizableUIInternal = {
          // We also need to remove the panel context menu if it's there:
          this.ensureButtonContextMenu(widgetNode);
          if (gPalette.has(aWidgetId) || this.isSpecialWidget(aWidgetId)) {
@@ -95,7 +98,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
          } else {
            window.gNavToolbox.palette.appendChild(widgetNode);
          }
-@@ -1971,16 +1968,16 @@ var CustomizableUIInternal = {
+@@ -2025,16 +2016,16 @@ var CustomizableUIInternal = {
          elem.setAttribute("skipintoolbarset", "true");
        }
      }
@@ -115,7 +118,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      // Handle initial state of vertical tabs.
      if (isVerticalTabs) {
        // Show the vertical tabs toolbar
-@@ -2222,6 +2219,10 @@ var CustomizableUIInternal = {
+@@ -2276,6 +2267,10 @@ var CustomizableUIInternal = {
     *   The identifier string of the area that aNode is being inserted into.
     */
    insertWidgetBefore(aNode, aNextNode, aContainer, aAreaId) {
@@ -126,7 +129,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      this.notifyDOMChange(aNode, aNextNode, aContainer, false, () => {
        this.setLocationAttributes(aNode, aAreaId);
        aContainer.insertBefore(aNode, aNextNode);
-@@ -4592,7 +4593,7 @@ var CustomizableUIInternal = {
+@@ -4652,7 +4647,7 @@ var CustomizableUIInternal = {
     * For all registered areas, builds those areas to reflect the current
     * placement state of all widgets.
     */
@@ -135,7 +138,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      for (let [areaId, areaNodes] of gBuildAreas) {
        let placements = gPlacements.get(areaId);
        let isFirstChangedToolbar = true;
-@@ -4603,7 +4604,7 @@ var CustomizableUIInternal = {
+@@ -4663,7 +4658,7 @@ var CustomizableUIInternal = {
          if (area.get("type") == CustomizableUI.TYPE_TOOLBAR) {
            let defaultCollapsed = area.get("defaultCollapsed");
            let win = areaNode.documentGlobal;
@@ -144,7 +147,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
              win.setToolbarVisibility(
                areaNode,
                typeof defaultCollapsed == "string"
-@@ -5899,6 +5900,7 @@ export var CustomizableUI = {
+@@ -5976,6 +5971,7 @@ export var CustomizableUI = {
    unregisterArea(aName, aDestroyPlacements) {
      CustomizableUIInternal.unregisterArea(aName, aDestroyPlacements);
    },
@@ -152,7 +155,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
    /**
     * Add a widget to an area.
     * If the area to which you try to add is not known to CustomizableUI,
-@@ -7869,7 +7871,9 @@ class OverflowableToolbar {
+@@ -7951,7 +7947,9 @@ class OverflowableToolbar {
          );
  
          if (webExtList && CustomizableUI.isWebExtensionWidget(child.id)) {
@@ -162,16 +165,27 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
            webExtList.insertBefore(child, webExtList.firstElementChild);
          } else {
            child.setAttribute("cui-anchorid", this.#defaultListButton.id);
-@@ -7929,7 +7933,7 @@ class OverflowableToolbar {
+@@ -8000,6 +7998,7 @@ class OverflowableToolbar {
+       return aElement.getBoundingClientRect().width;
+     }
+ 
++    let toolbar = this.#toolbar;
+     function sumChildrenInlineSize(aParent, aExceptChild = null) {
+       let sum = 0;
+       for (let child of aParent.children) {
+@@ -8011,7 +8010,10 @@ class OverflowableToolbar {
          ) {
            continue;
          }
 -        sum += parseFloat(style.marginLeft) + parseFloat(style.marginRight);
 +        sum += parseFloat(style.marginLeft) + (win.gZenVerticalTabsManager._hasSetSingleToolbar ? Math.max(0, parseFloat(style.marginRight)) : parseFloat(style.marginRight));
++        if (toolbar.id == 'zen-sidebar-top-buttons' && toolbar.hasAttribute("overflowing")) {
++          sum += 2; // Add extra padding that we remove from the CSS
++        }
          if (child != aExceptChild) {
            sum += getInlineSize(child);
          }
-@@ -7953,11 +7957,11 @@ class OverflowableToolbar {
+@@ -8035,11 +8037,11 @@ class OverflowableToolbar {
          parseFloat(style.paddingLeft) -
          parseFloat(style.paddingRight) -
          toolbarChildrenWidth;
@@ -185,7 +199,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      });
  
      lazy.log.debug(
-@@ -7972,7 +7976,39 @@ class OverflowableToolbar {
+@@ -8054,7 +8056,39 @@ class OverflowableToolbar {
        Math.max(targetWidth, targetChildrenWidth)
      );
      totalAvailWidth = Math.ceil(totalAvailWidth);
@@ -226,7 +240,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      return { isOverflowing, targetContentWidth, totalAvailWidth };
    }
  
-@@ -8033,7 +8069,11 @@ class OverflowableToolbar {
+@@ -8115,7 +8149,11 @@ class OverflowableToolbar {
              return;
            }
          }
@@ -239,7 +253,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
            lazy.log.debug(
              `Need ${minSize} but width is ${totalAvailWidth} so bailing`
            );
-@@ -8066,7 +8106,7 @@ class OverflowableToolbar {
+@@ -8148,7 +8186,7 @@ class OverflowableToolbar {
          }
        }
        if (!inserted) {
@@ -248,7 +262,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
        }
        child.removeAttribute("cui-anchorid");
        child.removeAttribute("overflowedItem");
-@@ -8192,6 +8232,9 @@ class OverflowableToolbar {
+@@ -8274,6 +8312,9 @@ class OverflowableToolbar {
     *   if no such list exists.
     */
    get #webExtList() {
@@ -258,7 +272,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      if (!this.#webExtListRef) {
        let targetID = this.#toolbar.getAttribute("addon-webext-overflowtarget");
        if (!targetID) {
-@@ -8203,6 +8246,9 @@ class OverflowableToolbar {
+@@ -8285,6 +8326,9 @@ class OverflowableToolbar {
        let win = this.#toolbar.documentGlobal;
        let { panel } = win.gUnifiedExtensions;
        this.#webExtListRef = panel.querySelector(`#${targetID}`);
@@ -268,7 +282,7 @@ index 491161e48044f75167a8e8a0348779cfa22fc40e..867d51b8a6b74f841afc6d84dcdfd8f2
      }
      return this.#webExtListRef;
    }
-@@ -8411,7 +8457,7 @@ class OverflowableToolbar {
+@@ -8493,7 +8537,7 @@ class OverflowableToolbar {
          break;
        }
        case "mousedown": {

src/browser/components/preferences/config/account-sync-mjs.patch

@@ -1,16 +1,17 @@
 diff --git a/browser/components/preferences/config/account-sync.mjs b/browser/components/preferences/config/account-sync.mjs
-index b503987a08e2ce64bfc01c4e3a21e5e19ef834f0..b1c03a0b219fd3eddd93c1deaeb18ab79c85f168 100644
+index b01fd4bb163ad53139fcbd8e79e12ef994d1fa13..7e3c2f6852b77192b4505bb3d5a7b58586da6548 100644
 --- a/browser/components/preferences/config/account-sync.mjs
 +++ b/browser/components/preferences/config/account-sync.mjs
-@@ -42,6 +42,7 @@ Preferences.addAll([
+@@ -46,6 +46,8 @@ Preferences.addAll([
    { id: "services.sync.engine.creditcards", type: "bool" },
    { id: "services.sync.engine.addons", type: "bool" },
    { id: "services.sync.engine.prefs", type: "bool" },
 +  { id: "services.sync.engine.spaces", type: "bool" },
++  { id: "zen.spaces-sync.normal-tabs", type: "bool" },
  ]);
  
  /**
-@@ -546,6 +547,7 @@ const SYNC_ENGINE_SETTINGS = [
+@@ -557,6 +559,7 @@ const SYNC_ENGINE_SETTINGS = [
      type: "payments",
    },
    { id: "syncAddons", pref: "services.sync.engine.addons", type: "addons" },
@@ -18,3 +19,50 @@ index b503987a08e2ce64bfc01c4e3a21e5e19ef834f0..b1c03a0b219fd3eddd93c1deaeb18ab7
    { id: "syncSettings", pref: "services.sync.engine.prefs", type: "settings" },
  ];
  
+@@ -564,6 +567,18 @@ SYNC_ENGINE_SETTINGS.forEach(({ id, pref }) => {
+   Preferences.addSetting({ id, pref });
+ });
+ 
++Preferences.addSetting({ id: "zenSyncWorkspacesGroup" });
++Preferences.addSetting({
++  id: "zenSyncWorkspaces",
++  pref: "services.sync.engine.spaces",
++});
++Preferences.addSetting({
++  id: "zenSyncNormalTabs",
++  pref: "zen.spaces-sync.normal-tabs",
++  deps: ["zenSyncWorkspaces"],
++  visible: deps => !!deps.zenSyncWorkspaces.value,
++});
++
+ Preferences.addSetting({
+   id: "syncEngines",
+   deps: SYNC_ENGINE_SETTINGS.map(({ id }) => id),
+@@ -995,6 +1010,27 @@ SettingGroupManager.registerGroups({
+             id: "syncEnginesList",
+             control: "sync-engines-list",
+           },
++          {
++            id: "zenSyncWorkspacesGroup",
++            control: "moz-box-item",
++            items: [
++              {
++                id: "zenSyncWorkspaces",
++                l10nId: "zen-settings-workspaces-sync",
++                control: "moz-toggle",
++                controlAttrs: {
++                  inputlayout: "inline-end",
++                },
++                items: [
++                  {
++                    id: "zenSyncNormalTabs",
++                    l10nId: "zen-settings-normal-tabs-sync",
++                    control: "moz-checkbox",
++                  },
++                ],
++              },
++            ],
++          },
+           {
+             id: "syncChangeOptions",
+             control: "moz-box-button",

src/browser/components/preferences/main-js.patch

@@ -1,8 +1,8 @@
 diff --git a/browser/components/preferences/main.js b/browser/components/preferences/main.js
-index 88675d1bcbf000b10d85a9c0980bc6069d88052c..ed3a1e809eb0fcccc5a957be7affb77be8978e32 100644
+index 5a56d348146c1c37c088ced60327fffebcf8fac0..abd65594d365fbc0a74af3953c71f410301898ad 100644
 --- a/browser/components/preferences/main.js
 +++ b/browser/components/preferences/main.js
-@@ -528,6 +528,11 @@ function createStartupConfig(hidden = false) {
+@@ -529,6 +529,11 @@ function createStartupConfig(hidden = false) {
            },
          ],
        },
@@ -14,7 +14,7 @@ index 88675d1bcbf000b10d85a9c0980bc6069d88052c..ed3a1e809eb0fcccc5a957be7affb77b
        {
          id: "windowsLaunchOnLogin",
          l10nId: "windows-launch-on-login",
-@@ -575,7 +580,7 @@ function createStartupConfig(hidden = false) {
+@@ -576,7 +581,7 @@ function createStartupConfig(hidden = false) {
  SettingGroupManager.registerGroups({
    defaultBrowser: createDefaultBrowserConfig(),
    startup: createStartupConfig(
@@ -23,7 +23,7 @@ index 88675d1bcbf000b10d85a9c0980bc6069d88052c..ed3a1e809eb0fcccc5a957be7affb77b
    ),
  });
  
-@@ -628,7 +633,7 @@ function getBundleForLocales(newLocales) {
+@@ -636,7 +641,7 @@ function getBundleForLocales(newLocales) {
      ])
    );
    return new Localization(

src/browser/components/preferences/preferences-js.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/components/preferences/preferences.js b/browser/components/preferences/preferences.js
-index a76699af75252bec31e17b562463c37236cbbfe5..6355a6ee92754846ffcdd123ac49545d520470c7 100644
+index 94612d8e28af58fcb04914440348b899a0a1e08f..da3b1ffd09745d09589283356d1001dbfb76a468 100644
 --- a/browser/components/preferences/preferences.js
 +++ b/browser/components/preferences/preferences.js
 @@ -132,6 +132,7 @@ ChromeUtils.defineLazyGetter(this, "gSubDialog", function () {
@@ -10,7 +10,7 @@ index a76699af75252bec31e17b562463c37236cbbfe5..6355a6ee92754846ffcdd123ac49545d
        ],
        resizeCallback: async ({ title, frame }) => {
          // Search within main document and highlight matched keyword.
-@@ -462,6 +463,8 @@ const CONFIG_PANES = Object.freeze({
+@@ -471,6 +472,8 @@ const CONFIG_PANES = Object.freeze({
    tabsBrowsing: {
      l10nId: "tabs-browsing-section",
      groupIds: [
@@ -19,7 +19,7 @@ index a76699af75252bec31e17b562463c37236cbbfe5..6355a6ee92754846ffcdd123ac49545d
        "browserLayout",
        "tabs",
        "pageNavigation",
-@@ -509,7 +512,7 @@ function register_module(categoryName, categoryObject) {
+@@ -518,7 +521,7 @@ function register_module(categoryName, categoryObject) {
        }
        this._initted = true;
        let template = document.getElementById("template-" + categoryName);
@@ -28,7 +28,7 @@ index a76699af75252bec31e17b562463c37236cbbfe5..6355a6ee92754846ffcdd123ac49545d
          // Replace the template element with the nodes inside of it.
          template.replaceWith(template.content);
  
-@@ -553,6 +556,10 @@ function init_all() {
+@@ -562,6 +565,10 @@ function init_all() {
    register_module("paneHome", gHomePane);
    register_module("paneSearch", gSearchPane);
    register_module("panePrivacy", gPrivacyPane);

src/browser/components/preferences/preferences-xhtml.patch

@@ -27,7 +27,7 @@ index 1b8c38159314b6edee9e6f455beb2b63db1ad3f0..1308345db640dba6b2848b49ef7c1181
 +      </html:moz-page-nav-button>
 +      <html:moz-page-nav-button id="category-zen-CKS"
 +        view="paneZenCKS"
-+        iconsrc="chrome://browser/skin/quickactions.svg"
++        iconsrc="chrome://browser/skin/preferences/category-accessibility.svg"
 +        data-l10n-id="pane-zen-CKS-title">
 +      </html:moz-page-nav-button>
 +      <html:moz-page-nav-button id="category-zen-marketplace"

src/browser/components/preferences/zen-settings.js

@@ -38,9 +38,16 @@ var gZenMarketplaceManager = {
 
     this.__hasInitializedEvents = true;
 
-    await this._buildModsList();
-
     Services.prefs.addObserver(gZenMods.updatePref, this);
+    window.addEventListener(
+      "unload",
+      () => {
+        Services.prefs.removeObserver(gZenMods.updatePref, this);
+      },
+      { once: true }
+    );
+
+    await this._buildModsList();
 
     const checkForUpdateClick = (event) => {
       if (event.target === checkForUpdates) {
@@ -69,7 +76,6 @@ var gZenMarketplaceManager = {
     });
 
     window.addEventListener("unload", () => {
-      Services.prefs.removeObserver(gZenMods.updatePref, this);
       this.__hasInitializedEvents = false;
 
       document.removeEventListener("ZenModsMarketplace:CheckForUpdatesFinished", this);
@@ -735,7 +741,6 @@ var gZenWorkspacesSettings = {
 
     Services.prefs.addObserver("zen.glance.enabled", tabsUnloaderPrefListener); // We can use the same listener for both prefs
     Services.prefs.addObserver("zen.workspaces.separate-essentials", tabsUnloaderPrefListener);
-    Services.prefs.addObserver("zen.glance.activation-method", tabsUnloaderPrefListener);
     Services.prefs.addObserver("zen.window-sync.sync-only-pinned-tabs", tabsUnloaderPrefListener);
     Services.prefs.addObserver(
       "zen.tabs.ctrl-tab.ignore-essential-tabs",
@@ -744,7 +749,6 @@ var gZenWorkspacesSettings = {
     Services.prefs.addObserver("browser.ctrlTab.sortByRecentlyUsed", toggleZenCycleByAttrWarning);
     window.addEventListener("unload", () => {
       Services.prefs.removeObserver("zen.glance.enabled", tabsUnloaderPrefListener);
-      Services.prefs.removeObserver("zen.glance.activation-method", tabsUnloaderPrefListener);
       Services.prefs.removeObserver("zen.workspaces.separate-essentials", tabsUnloaderPrefListener);
       Services.prefs.removeObserver(
         "zen.window-sync.sync-only-pinned-tabs",

src/browser/components/sessionstore/SessionFile-sys-mjs.patch

@@ -1,16 +1,16 @@
 diff --git a/browser/components/sessionstore/SessionFile.sys.mjs b/browser/components/sessionstore/SessionFile.sys.mjs
-index 5580838acd72bf0e1189d367984859529d89f5b4..e5fa6076a9cc6ada016ccc4e129cad455010a522 100644
+index 370e5c105c3d9bee05c2d9d7b63d0ee45b8331e1..1c37c19794ebe863a25f780e9a74d63526b929d7 100644
 --- a/browser/components/sessionstore/SessionFile.sys.mjs
 +++ b/browser/components/sessionstore/SessionFile.sys.mjs
-@@ -22,6 +22,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
-   RunState: "resource:///modules/sessionstore/RunState.sys.mjs",
-   SessionStore: "resource:///modules/sessionstore/SessionStore.sys.mjs",
-   SessionWriter: "resource:///modules/sessionstore/SessionWriter.sys.mjs",
+@@ -25,6 +25,7 @@ const lazy = XPCOMUtils.declareLazy({
+     "moz-src:///browser/components/sessionstore/SessionStore.sys.mjs",
+   SessionWriter:
+     "moz-src:///browser/components/sessionstore/SessionWriter.sys.mjs",
 +  ZenSessionStore: "resource:///modules/zen/ZenSessionManager.sys.mjs",
  });
  
  const PREF_UPGRADE_BACKUP = "browser.sessionstore.upgradeBackup.latestBuildID";
-@@ -381,7 +382,7 @@ var SessionFileInternal = {
+@@ -384,7 +385,7 @@ var SessionFileInternal = {
      this._readOrigin = result.origin;
  
      result.noFilesFound = noFilesFound;

src/browser/components/sessionstore/SessionSaver-sys-mjs.patch

@@ -1,11 +1,11 @@
 diff --git a/browser/components/sessionstore/SessionSaver.sys.mjs b/browser/components/sessionstore/SessionSaver.sys.mjs
-index 9141793550f7c7ff6aa63d4c85bf571b4499e2d0..6906fd9be7ae6ca4316133e0d6552b797c54a7ec 100644
+index 1f26bc5fdb83f55bdf0b9b7d01fafe1cd37f77f4..5916f741d0fa04c392dcdd10f843e595fe5e058c 100644
 --- a/browser/components/sessionstore/SessionSaver.sys.mjs
 +++ b/browser/components/sessionstore/SessionSaver.sys.mjs
-@@ -20,6 +20,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
-   SessionFile: "resource:///modules/sessionstore/SessionFile.sys.mjs",
-   SessionStore: "resource:///modules/sessionstore/SessionStore.sys.mjs",
-   sessionStoreLogger: "resource:///modules/sessionstore/SessionLogger.sys.mjs",
+@@ -20,6 +20,7 @@ const lazy = XPCOMUtils.declareLazy({
+     "moz-src:///browser/components/sessionstore/SessionStore.sys.mjs",
+   sessionStoreLogger:
+     "moz-src:///browser/components/sessionstore/SessionLogger.sys.mjs",
 +  ZenSessionStore: "resource:///modules/zen/ZenSessionManager.sys.mjs",
  });
  

src/browser/components/sessionstore/SessionStartup-sys-mjs.patch

@@ -1,16 +1,16 @@
 diff --git a/browser/components/sessionstore/SessionStartup.sys.mjs b/browser/components/sessionstore/SessionStartup.sys.mjs
-index 86600ffb5178599ab23270a964064ca657a3283f..70d7b5c7d69d3700475d663b595052264c67d351 100644
+index 919d4536c5462603346684bbe26794ae9279b517..5a8fae0708e4a9a82c5e85f8a473ebaeafebe71f 100644
 --- a/browser/components/sessionstore/SessionStartup.sys.mjs
 +++ b/browser/components/sessionstore/SessionStartup.sys.mjs
-@@ -40,6 +40,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
-   StartupPerformance:
-     "resource:///modules/sessionstore/StartupPerformance.sys.mjs",
-   sessionStoreLogger: "resource:///modules/sessionstore/SessionLogger.sys.mjs",
+@@ -41,6 +41,7 @@ const lazy = XPCOMUtils.declareLazy({
+     "moz-src:///browser/components/sessionstore/StartupPerformance.sys.mjs",
+   sessionStoreLogger:
+     "moz-src:///browser/components/sessionstore/SessionLogger.sys.mjs",
 +  ZenSessionStore: "resource:///modules/zen/ZenSessionManager.sys.mjs",
  });
  
  const STATE_RUNNING_STR = "running";
-@@ -85,7 +86,7 @@ export var SessionStartup = {
+@@ -86,7 +87,7 @@ export var SessionStartup = {
      }
  
      // do not need to initialize anything in auto-started private browsing sessions
@@ -19,7 +19,7 @@ index 86600ffb5178599ab23270a964064ca657a3283f..70d7b5c7d69d3700475d663b59505226
        this._initialized = true;
        gOnceInitializedDeferred.resolve();
        return;
-@@ -179,6 +180,8 @@ export var SessionStartup = {
+@@ -180,6 +181,8 @@ export var SessionStartup = {
        this._initialState = parsed;
      }
  
@@ -28,7 +28,7 @@ index 86600ffb5178599ab23270a964064ca657a3283f..70d7b5c7d69d3700475d663b59505226
      if (this._initialState == null) {
        // No valid session found.
        this._sessionType = this.NO_SESSION;
-@@ -276,6 +279,8 @@ export var SessionStartup = {
+@@ -277,6 +280,8 @@ export var SessionStartup = {
          `Previous shutdown ok? ${this._previousSessionCrashed}, reason: ${previousSessionCrashedReason}`
        );
  
@@ -37,7 +37,7 @@ index 86600ffb5178599ab23270a964064ca657a3283f..70d7b5c7d69d3700475d663b59505226
        Services.obs.addObserver(this, "sessionstore-windows-restored", true);
  
        if (this.sessionType == this.NO_SESSION) {
-@@ -336,12 +341,7 @@ export var SessionStartup = {
+@@ -337,12 +342,7 @@ export var SessionStartup = {
    isAutomaticRestoreEnabled() {
      if (this._resumeSessionEnabled === null) {
        this._resumeSessionEnabled =
@@ -51,7 +51,7 @@ index 86600ffb5178599ab23270a964064ca657a3283f..70d7b5c7d69d3700475d663b59505226
      }
  
      return this._resumeSessionEnabled;
-@@ -354,8 +354,7 @@ export var SessionStartup = {
+@@ -355,8 +355,7 @@ export var SessionStartup = {
     */
    willRestore() {
      return (

src/browser/components/sessionstore/SessionStore-sys-mjs.patch

@@ -1,8 +1,8 @@
 diff --git a/browser/components/sessionstore/SessionStore.sys.mjs b/browser/components/sessionstore/SessionStore.sys.mjs
-index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2ab6e6c967 100644
+index 52fc803050cd257d6de52b1e4a92f3211cbaba88..a9841832ddce540dc0f9b14c29e5eadac7510935 100644
 --- a/browser/components/sessionstore/SessionStore.sys.mjs
 +++ b/browser/components/sessionstore/SessionStore.sys.mjs
-@@ -129,6 +129,11 @@ const TAB_EVENTS = [
+@@ -111,6 +111,11 @@ const TAB_EVENTS = [
    "TabSplitViewActivate",
    "SplitViewRemoved",
    "SplitViewCreated",
@@ -14,16 +14,39 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
  ];
  
  const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
-@@ -201,6 +206,8 @@ ChromeUtils.defineESModuleGetters(lazy, {
-   TabStateCache: "resource:///modules/sessionstore/TabStateCache.sys.mjs",
-   TabStateFlusher: "resource:///modules/sessionstore/TabStateFlusher.sys.mjs",
+@@ -185,6 +190,8 @@ const lazy = XPCOMUtils.declareLazy({
+   TabStateFlusher:
+     "moz-src:///browser/components/sessionstore/TabStateFlusher.sys.mjs",
    setTimeout: "resource://gre/modules/Timer.sys.mjs",
 +  ZenSessionStore: "resource:///modules/zen/ZenSessionManager.sys.mjs",
 +  ZenWindowSync: "resource:///modules/zen/ZenWindowSync.sys.mjs",
- });
+   blankURI: () => Services.io.newURI("about:blank"),
+   gRestoreWindowsToVirtualDesktop: {
+     pref: "browser.sessionstore.restore_windows_to_virtual_desktop",
+@@ -348,6 +355,22 @@ class _SessionStore {
+     return this.#shouldRestoreLastSession;
+   }
  
- ChromeUtils.defineLazyGetter(lazy, "blankURI", () => {
-@@ -1317,10 +1324,7 @@ var SessionStoreInternal = {
++  get _windows() {
++    return this.#windows;
++  }
++
++  get _browserWindows() {
++    return this.#browserWindows;
++  }
++
++  set _deferredInitialState(aState) {
++    this.#deferredInitialState = aState;
++  }
++
++  initializeWindow(aWindow, aInitialState) {
++    this.#initializeWindow(aWindow, aInitialState);
++  }
++
+   // whether we will potentially be restoring the session
+   // more than once without Firefox restarting in between
+   #restoreWithoutRestart = false;
+@@ -515,10 +538,7 @@ class _SessionStore {
     */
    get willAutoRestore() {
      return (
@@ -33,9 +56,9 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
 -          BROWSER_STARTUP_RESUME_SESSION)
 +      true
      );
-   },
+   }
  
-@@ -2008,6 +2012,11 @@ var SessionStoreInternal = {
+@@ -1215,6 +1235,11 @@ class _SessionStore {
        case "TabPinned":
        case "TabUnpinned":
        case "SwapDocShells":
@@ -44,47 +67,47 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
 +      case "TabMove":
 +      case "TabGroupMoved":
 +      case "ZenWorkspaceDataChanged":
-         this.saveStateDelayed(win);
+         this.#saveStateDelayed(win);
          break;
        case "TabGroupCreate":
-@@ -2117,6 +2126,10 @@ var SessionStoreInternal = {
-       this._windows[aWindow.__SSi].isTaskbarTab = true;
+@@ -1341,6 +1366,10 @@ class _SessionStore {
+       this.#windows[aWindow.__SSi].isTaskbarTab = true;
      }
  
 +    if (aWindow.document.documentElement.hasAttribute("zen-unsynced-window")) {
-+      this._windows[aWindow.__SSi].isZenUnsynced = true;
++      this.#windows[aWindow.__SSi].isZenUnsynced = true;
 +    }
 +
      if (lazy.AIWindow.isAIWindowActiveAndEnabled(aWindow)) {
-       this._windows[aWindow.__SSi].isAIWindow = true;
+       this.#windows[aWindow.__SSi].isAIWindow = true;
      }
-@@ -2153,7 +2166,7 @@ var SessionStoreInternal = {
-     let isTaskbarTab = this._windows[aWindow.__SSi].isTaskbarTab;
+@@ -1377,7 +1406,7 @@ class _SessionStore {
+     let isTaskbarTab = this.#windows[aWindow.__SSi].isTaskbarTab;
      // A regular window is not a private window, taskbar tab window, or popup window
      let isRegularWindow =
 -      !isPrivateWindow && !isTaskbarTab && aWindow.toolbar.visible;
-+      !isPrivateWindow && !isTaskbarTab && aWindow.toolbar.visible && !this._windows[aWindow.__SSi].isZenUnsynced;
++      !isPrivateWindow && !isTaskbarTab && aWindow.toolbar.visible && !this.#windows[aWindow.__SSi].isZenUnsynced;
  
      // perform additional initialization when the first window is loading
      if (lazy.RunState.isStopped) {
-@@ -2165,7 +2178,7 @@ var SessionStoreInternal = {
+@@ -1389,7 +1418,7 @@ class _SessionStore {
          // to disk to NOW() to enforce a full interval before the next write.
          lazy.SessionSaver.updateLastSaveTime();
  
 -        if (isPrivateWindow || isTaskbarTab) {
 +        if (isPrivateWindow || isTaskbarTab || aWindow.document.documentElement.hasAttribute("zen-unsynced-window")) {
-           this._log.debug(
+           this.#log.debug(
              "initializeWindow, the window is private or a web app. Saving SessionStartup.state for possibly restoring later"
            );
-@@ -2209,6 +2222,7 @@ var SessionStoreInternal = {
+@@ -1433,6 +1462,7 @@ class _SessionStore {
            null,
            "sessionstore-one-or-no-tab-restored"
          );
 +        lazy.ZenSessionStore.onNewEmptySession(aWindow);
-         this._deferredAllWindowsRestored.resolve();
+         this.#deferredAllWindowsRestored.resolve();
        }
-       // this window was opened by _openWindowWithState
-@@ -2258,7 +2272,6 @@ var SessionStoreInternal = {
+       // this window was opened by #openWindowWithState
+@@ -1482,7 +1512,6 @@ class _SessionStore {
        if (closedWindowState) {
          let newWindowState;
          if (
@@ -92,25 +115,25 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
            !lazy.SessionStartup.willRestore()
          ) {
            // We want to split the window up into pinned tabs and unpinned tabs.
-@@ -2294,6 +2307,7 @@ var SessionStoreInternal = {
+@@ -1518,6 +1547,7 @@ class _SessionStore {
          }
  
          if (newWindowState) {
 +          lazy.ZenSessionStore.onRestoringClosedWindow(newWindowState);
            // Ensure that the window state isn't hidden
-           this._restoreCount = 1;
+           this.#restoreCount = 1;
            let state = { windows: [newWindowState] };
-@@ -2330,6 +2344,9 @@ var SessionStoreInternal = {
+@@ -1554,6 +1584,9 @@ class _SessionStore {
        });
-       this._shouldRestoreLastSession = false;
+       this.#shouldRestoreLastSession = false;
      }
 +    else if (!aInitialState && isRegularWindow) {
 +      lazy.ZenSessionStore.restoreNewWindow(aWindow, this);
 +    }
  
-     if (this._restoreLastWindow && aWindow.toolbar.visible) {
+     if (this.#restoreLastWindow && aWindow.toolbar.visible) {
        // always reset (if not a popup window)
-@@ -2480,7 +2497,7 @@ var SessionStoreInternal = {
+@@ -1704,7 +1737,7 @@ class _SessionStore {
  
      var tabbrowser = aWindow.gBrowser;
  
@@ -119,56 +142,56 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
  
      TAB_EVENTS.forEach(function (aEvent) {
        tabbrowser.tabContainer.removeEventListener(aEvent, this, true);
-@@ -2531,7 +2548,7 @@ var SessionStoreInternal = {
+@@ -1755,7 +1788,7 @@ class _SessionStore {
  
        let isLastRegularWindow =
-         Object.values(this._windows).filter(
+         Object.values(this.#windows).filter(
 -          wData => !wData.isPrivate && !wData.isTaskbarTab
 +          wData => !wData.isPrivate && !wData.isTaskbarTab && !wData.isZenUnsynced
          ).length == 1;
-       this._log.debug(
+       this.#log.debug(
          `onClose, closing window isLastRegularWindow? ${isLastRegularWindow}`
-@@ -2588,8 +2605,8 @@ var SessionStoreInternal = {
+@@ -1812,8 +1845,8 @@ class _SessionStore {
        // 2) Flush the window.
        // 3) When the flush is complete, revisit our decision to store the window
-       //    in _closedWindows, and add/remove as necessary.
+       //    in #closedWindows, and add/remove as necessary.
 -      if (!winData.isPrivate && !winData.isTaskbarTab) {
--        this.maybeSaveClosedWindow(winData, isLastWindow);
+-        this.#maybeSaveClosedWindow(winData, isLastWindow);
 +      if (!winData.isPrivate && !winData.isTaskbarTab && !winData.isZenUnsynced) {
-+        this.maybeSaveClosedWindow(winData, isLastWindow, isLastRegularWindow);
++        this.#maybeSaveClosedWindow(winData, isLastWindow, isLastRegularWindow);
        }
  
        completionPromise = lazy.TabStateFlusher.flushWindow(aWindow).then(() => {
-@@ -2609,8 +2626,9 @@ var SessionStoreInternal = {
+@@ -1833,8 +1866,9 @@ class _SessionStore {
  
          // Save non-private windows if they have at
          // least one saveable tab or are the last window.
 -        if (!winData.isPrivate && !winData.isTaskbarTab) {
--          this.maybeSaveClosedWindow(winData, isLastWindow);
+-          this.#maybeSaveClosedWindow(winData, isLastWindow);
 +        lazy.ZenWindowSync.on_WindowCloseAndBrowserFlushed(browsers);
 +        if (!winData.isPrivate && !winData.isTaskbarTab && !winData.isZenUnsynced) {
-+          this.maybeSaveClosedWindow(winData, isLastWindow, isLastRegularWindow);
++          this.#maybeSaveClosedWindow(winData, isLastWindow, isLastRegularWindow);
  
            if (!isLastWindow && winData.closedId > -1) {
-             this._addClosedAction(
-@@ -2686,7 +2704,7 @@ var SessionStoreInternal = {
+             this.#addClosedAction(
+@@ -1910,7 +1944,7 @@ class _SessionStore {
     *        to call this method again asynchronously (for example, after
     *        a window flush).
     */
--  maybeSaveClosedWindow(winData, isLastWindow) {
-+  maybeSaveClosedWindow(winData, isLastWindow, isLastRegularWindow = false) {
+-  #maybeSaveClosedWindow(winData, isLastWindow) {
++  #maybeSaveClosedWindow(winData, isLastWindow, isLastRegularWindow = false) {
      // Make sure SessionStore is still running, and make sure that we
      // haven't chosen to forget this window.
      if (
-@@ -2703,6 +2721,7 @@ var SessionStoreInternal = {
-       // _closedWindows from a previous call to this function.
-       let winIndex = this._closedWindows.indexOf(winData);
+@@ -1927,6 +1961,7 @@ class _SessionStore {
+       // #closedWindows from a previous call to this function.
+       let winIndex = this.#closedWindows.indexOf(winData);
        let alreadyStored = winIndex != -1;
 +      lazy.ZenSessionStore.maybeSaveClosedWindow(winData, isLastRegularWindow);
        // If sidebar command is truthy, i.e. sidebar is open, store sidebar settings
        let shouldStore = hasSaveableTabs || isLastWindow;
  
-@@ -3525,7 +3544,7 @@ var SessionStoreInternal = {
+@@ -2744,7 +2779,7 @@ class _SessionStore {
      if (!isPrivateWindow && tabState.isPrivate) {
        return;
      }
@@ -177,10 +200,14 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
        return;
      }
  
-@@ -4264,6 +4283,12 @@ var SessionStoreInternal = {
+@@ -3511,7 +3546,15 @@ class _SessionStore {
+         1,
          Math.min(tabState.index, tabState.entries.length)
        );
-       tabState.pinned = false;
+-      tabState.pinned = false;
++      tabState.pinned =
++        newTab.group?.isZenFolder === true &&
++        Services.prefs.getBoolPref("zen.folders.owned-tabs-in-folder");
 +      tabState.zenEssential = false;
 +      tabState.zenSyncId = null;
 +      tabState.zenIsGlance = false;
@@ -190,7 +217,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
  
        if (inBackground === false) {
          aWindow.gBrowser.selectedTab = newTab;
-@@ -4697,6 +4722,8 @@ var SessionStoreInternal = {
+@@ -4036,6 +4079,8 @@ class _SessionStore {
        // Append the tab if we're opening into a different window,
        tabIndex: aSource == aTargetWindow ? pos : Infinity,
        pinned: state.pinned,
@@ -199,7 +226,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
        userContextId: state.userContextId,
        skipLoad: true,
        preferredRemoteType,
-@@ -5194,9 +5221,10 @@ var SessionStoreInternal = {
+@@ -4608,9 +4653,10 @@ class _SessionStore {
        if (activePageData.title && activePageData.title != activePageData.url) {
          win.gBrowser.setInitialTabTitle(tab, activePageData.title, {
            isContentTitle: true,
@@ -211,7 +238,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
        }
      }
  
-@@ -5561,7 +5589,7 @@ var SessionStoreInternal = {
+@@ -4982,7 +5028,7 @@ class _SessionStore {
  
      for (let i = tabbrowser.pinnedTabCount; i < tabbrowser.tabs.length; i++) {
        let tab = tabbrowser.tabs[i];
@@ -220,30 +247,30 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
          removableTabs.push(tab);
        }
      }
-@@ -5674,7 +5702,7 @@ var SessionStoreInternal = {
+@@ -5095,7 +5141,7 @@ class _SessionStore {
  
      // collect the data for all windows
-     for (ix in this._windows) {
--      if (this._windows[ix]._restoring || this._windows[ix].isTaskbarTab) {
-+      if (this._windows[ix]._restoring || this._windows[ix].isTaskbarTab && !this._windows[ix].isZenUnsynced) {
-         // window data is still in _statesToRestore
+     for (ix in this.#windows) {
+-      if (this.#windows[ix]._restoring || this.#windows[ix].isTaskbarTab) {
++      if (this.#windows[ix]._restoring || this.#windows[ix].isTaskbarTab && !this.#windows[ix].isZenUnsynced) {
+         // window data is still in #statesToRestore
          continue;
        }
-@@ -5818,11 +5846,12 @@ var SessionStoreInternal = {
+@@ -5239,11 +5285,12 @@ class _SessionStore {
      }
  
      let tabbrowser = aWindow.gBrowser;
 -    let tabs = tabbrowser.tabs;
 +    let tabs = aWindow.gZenWorkspaces.allStoredTabs;
      /** @type {WindowStateData} */
-     let winData = this._windows[aWindow.__SSi];
+     let winData = this.#windows[aWindow.__SSi];
      let tabsData = (winData.tabs = []);
  
 +    winData.splitViewData = aWindow.gZenViewSplitter?.storeDataForSessionStore();
      // update the internal state data for this window
      for (let tab of tabs) {
        if (tab == aWindow.FirefoxViewHandler.tab) {
-@@ -5833,6 +5862,9 @@ var SessionStoreInternal = {
+@@ -5254,6 +5301,9 @@ class _SessionStore {
        tabsData.push(tabData);
      }
  
@@ -253,7 +280,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
      // update tab group state for this window
      winData.groups = [];
      for (let tabGroup of aWindow.gBrowser.tabGroups) {
-@@ -5849,7 +5881,7 @@ var SessionStoreInternal = {
+@@ -5270,7 +5320,7 @@ class _SessionStore {
      // a window is closed, point to the first item in the tab strip instead (it will never be the Firefox View tab,
      // since it's only inserted into the tab strip after it's selected).
      if (aWindow.FirefoxViewHandler.tab?.selected) {
@@ -262,7 +289,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
        winData.title = tabbrowser.tabs[0].label;
      }
      winData.selected = selectedIndex;
-@@ -6051,8 +6083,8 @@ var SessionStoreInternal = {
+@@ -5472,8 +5522,8 @@ class _SessionStore {
      // selectTab represents.
      let selectTab = 0;
      if (overwriteTabs) {
@@ -273,7 +300,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
        selectTab = Math.min(selectTab, winData.tabs.length);
      }
  
-@@ -6074,6 +6106,7 @@ var SessionStoreInternal = {
+@@ -5495,6 +5545,7 @@ class _SessionStore {
      if (overwriteTabs) {
        for (let i = tabbrowser.browsers.length - 1; i >= 0; i--) {
          if (!tabbrowser.tabs[i].selected) {
@@ -281,7 +308,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
            tabbrowser.removeTab(tabbrowser.tabs[i]);
          }
        }
-@@ -6108,6 +6141,12 @@ var SessionStoreInternal = {
+@@ -5529,6 +5580,12 @@ class _SessionStore {
          savedTabGroup => !openTabGroupIdsInWindow.has(savedTabGroup.id)
        );
      }
@@ -294,7 +321,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
  
      // Move the originally open tabs to the end.
      if (initialTabs) {
-@@ -6674,6 +6713,25 @@ var SessionStoreInternal = {
+@@ -6098,6 +6155,25 @@ class _SessionStore {
  
      // Most of tabData has been restored, now continue with restoring
      // attributes that may trigger external events.
@@ -320,17 +347,25 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
  
      if (tabData.pinned) {
        tabbrowser.pinTab(tab);
-@@ -6859,6 +6917,9 @@ var SessionStoreInternal = {
+@@ -6272,6 +6348,9 @@ class _SessionStore {
          aWindow.gURLBar.readOnly = false;
        }
      }
 +    if (aWinData.isZenUnsynced) {
-+      this._windows[aWindow.__SSi].isZenUnsynced = true;
++      this.#windows[aWindow.__SSi].isZenUnsynced = true;
 +    }
  
      let promiseParts = Promise.withResolvers();
-     aWindow.setTimeout(() => {
-@@ -7654,7 +7715,7 @@ var SessionStoreInternal = {
+     const wasMinimized = aWindow.windowState == aWindow.STATE_MINIMIZED;
+@@ -6774,6 +6853,7 @@ class _SessionStore {
+    */
+   #isCmdLineEmpty(aWindow, aState) {
+     var pinnedOnly =
++      !Services.prefs.getBoolPref("zen.workspaces.continue-where-left-off") &&
+       aState.windows &&
+       aState.windows.every(win => win.tabs.every(tab => tab.pinned));
+ 
+@@ -7116,7 +7196,7 @@ class _SessionStore {
  
        let groupsToSave = new Map();
        for (let tIndex = 0; tIndex < window.tabs.length; ) {
@@ -339,7 +374,7 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
            // Adjust window.selected
            if (tIndex + 1 < window.selected) {
              window.selected -= 1;
-@@ -7669,7 +7730,7 @@ var SessionStoreInternal = {
+@@ -7131,7 +7211,7 @@ class _SessionStore {
            );
            // We don't want to increment tIndex here.
            continue;
@@ -348,15 +383,15 @@ index 536e06eec9f35bad3b8366733b23b5a8697df9c8..631a16bc7518108641993836f0c52e2a
            // Convert any open groups into saved groups.
            let groupStateToSave = window.groups.find(
              groupState => groupState.id == window.tabs[tIndex].groupId
-@@ -8233,7 +8294,6 @@ var SessionStoreInternal = {
+@@ -7691,7 +7771,6 @@ class _SessionStore {
      timer.initWithCallback(
-       function () {
+       () => {
          if (beats <= 0) {
--          this._log.debug(`looseTimer of ${delay} timed out`);
+-          this.#log.debug(`looseTimer of ${delay} timed out`);
            Glean.sessionRestore.shutdownFlushAllOutcomes.timed_out.add(1);
            deferred.resolve();
          }
-@@ -8711,6 +8771,7 @@ var SessionStoreInternal = {
+@@ -8174,6 +8253,7 @@ class _SessionStore {
      if (
        !savedTabGroupState.tabs.length ||
        this.getSavedTabGroup(savedTabGroupState.id)

src/browser/components/sessionstore/TabState-sys-mjs.patch

@@ -1,16 +1,16 @@
 diff --git a/browser/components/sessionstore/TabState.sys.mjs b/browser/components/sessionstore/TabState.sys.mjs
-index a33deeb5b587d6a950960a1a4781176e4e730ad7..e96cfb9a5ffbe4feccdffa8b6d18ececb48d4c52 100644
+index bb7bd8c7ca88f776188fce64e0c85beb5ceb27a5..bdec77ba26172fe1b41369b1d45d5a6f9d52ae25 100644
 --- a/browser/components/sessionstore/TabState.sys.mjs
 +++ b/browser/components/sessionstore/TabState.sys.mjs
-@@ -8,6 +8,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
-   PrivacyFilter: "resource://gre/modules/sessionstore/PrivacyFilter.sys.mjs",
-   TabAttributes: "resource:///modules/sessionstore/TabAttributes.sys.mjs",
-   TabStateCache: "resource:///modules/sessionstore/TabStateCache.sys.mjs",
+@@ -10,6 +10,7 @@ const lazy = XPCOMUtils.declareLazy({
+     "moz-src:///browser/components/sessionstore/TabAttributes.sys.mjs",
+   TabStateCache:
+     "moz-src:///browser/components/sessionstore/TabStateCache.sys.mjs",
 +  UrlbarShared: "chrome://browser/content/urlbar/UrlbarShared.mjs",
-   sessionStoreLogger: "resource:///modules/sessionstore/SessionLogger.sys.mjs",
+   sessionStoreLogger:
+     "moz-src:///browser/components/sessionstore/SessionLogger.sys.mjs",
  });
- 
-@@ -103,10 +104,28 @@ class _TabState {
+@@ -106,10 +107,28 @@ class _TabState {
        }
      }
  
@@ -39,3 +39,14 @@ index a33deeb5b587d6a950960a1a4781176e4e730ad7..e96cfb9a5ffbe4feccdffa8b6d18ecec
  
      tabData.userContextId = tab.userContextId || 0;
  
+@@ -135,6 +154,10 @@ class _TabState {
+       tabData.image = tabbrowser.getIcon(tab);
+     }
+ 
++    if (tab.zenStaticIcon) {
++      tabData.image = tab.zenStaticIcon;
++    }
++
+     // If there is a userTypedValue set, then either the user has typed something
+     // in the URL bar, or a new tab was opened with a URI to load.
+     // If so, we also track whether we were still in the process of loading something.

src/browser/components/tabbrowser/content/drag-and-drop-js.patch

@@ -1,8 +1,8 @@
 diff --git a/browser/components/tabbrowser/content/drag-and-drop.js b/browser/components/tabbrowser/content/drag-and-drop.js
-index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b15a030046 100644
+index f9623f82499e516050d523068e70ebaa4fe9a66a..95bcc078a86b4ec4b35f5916b7e4a5e305afba9e 100644
 --- a/browser/components/tabbrowser/content/drag-and-drop.js
 +++ b/browser/components/tabbrowser/content/drag-and-drop.js
-@@ -35,6 +35,9 @@
+@@ -42,6 +42,9 @@
     * @returns {MozTabbrowserTab|vbox}
     */
    const elementToMove = element => {
@@ -12,7 +12,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
      if (isTab(element) || isSplitViewWrapper(element)) {
        return element;
      }
-@@ -118,6 +121,9 @@
+@@ -140,6 +143,9 @@
        }
  
        let draggedTab = event.dataTransfer.mozGetDataAt(TAB_DROP_TYPE, 0);
@@ -22,15 +22,15 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
        if (
          (dropEffect == "move" || dropEffect == "copy") &&
          document == draggedTab.ownerDocument &&
-@@ -138,6 +144,7 @@
-           !draggedTab.group.collapsed
+@@ -161,6 +167,7 @@
          ) {
+           draggedTab.group.collapsedByDrag = true;
            draggedTab.group.collapsed = true;
 +          gZenFolders.animateGroupMove(draggedTab.group);
          }
  
          if (dropEffect == "move") {
-@@ -145,10 +152,6 @@
+@@ -168,10 +175,6 @@
  
            // Pinned tabs in expanded vertical mode are on a grid format and require
            // different logic to drag and drop.
@@ -41,7 +41,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
            this._animateTabMove(event);
            return;
          }
-@@ -287,6 +290,10 @@
+@@ -310,6 +313,10 @@
  
        this._tabDropIndicator.hidden = true;
        event.stopPropagation();
@@ -52,7 +52,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
        if (draggedTab && dropEffect == "copy") {
          let duplicatedDraggedTab;
          let duplicatedTabs = [];
-@@ -312,12 +319,16 @@
+@@ -337,12 +344,16 @@
          let translateOffsetY = oldTranslateY % tabHeight;
          let newTranslateX = oldTranslateX - translateOffsetX;
          let newTranslateY = oldTranslateY - translateOffsetY;
@@ -73,7 +73,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
  
          if (this._tabbrowserTabs.isContainerVerticalPinnedGrid(draggedTab)) {
            // Update both translate axis for pinned vertical expanded tabs
-@@ -392,11 +403,13 @@
+@@ -417,11 +428,13 @@
            this._dragToPinPromoCard,
          ];
          let shouldPin =
@@ -87,15 +87,15 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
            isTab(draggedTab) &&
            draggedTab.pinned &&
            this._tabbrowserTabs.arrowScrollbox.contains(event.target);
-@@ -466,6 +479,7 @@
+@@ -492,6 +505,7 @@
            }
          }
  
 +        shouldTranslate = false;
          if (shouldTranslate) {
+           this.#dropAnimationEndTime = Date.now() + DROP_ANIMATION_GRACE_MS;
            let translationPromises = [];
-           for (let item of movingTabs) {
-@@ -477,7 +491,7 @@
+@@ -504,7 +518,7 @@
                  item.removeAttribute("tabdrop-samewindow");
                  resolve();
                };
@@ -104,7 +104,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
                  postTransitionCleanup();
                } else {
                  let onTransitionEnd = transitionendEvent => {
-@@ -552,7 +566,7 @@
+@@ -595,7 +609,7 @@
            if (tab.selected) {
              selectedTab = tab;
              indexForSelectedTab = newIndex;
@@ -113,7 +113,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
              const droppedIntoPinnedArea = dropIndex < gBrowser.pinnedTabCount;
              const newSplitView = gBrowser.adoptSplitView(tab, {
                elementIndex: droppedIntoPinnedArea
-@@ -577,7 +591,7 @@
+@@ -620,7 +634,7 @@
              }
            }
          }
@@ -122,7 +122,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
            const newTab = gBrowser.adoptTab(selectedTab, {
              elementIndex: indexForSelectedTab,
              selectTab: selectedTab == draggedTab,
-@@ -611,10 +625,6 @@
+@@ -654,10 +668,6 @@
                this._tabbrowserTabs.dragAndDropElements[
                  gBrowser.pinnedTabCount + unpinnedSplitViews.length - 1
                ];
@@ -133,7 +133,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
            }
          }
        } else {
-@@ -664,6 +674,7 @@
+@@ -717,6 +727,7 @@
  
            let nextItem = this._tabbrowserTabs.dragAndDropElements[newIndex];
            let tabGroup = isTab(nextItem) && nextItem.group;
@@ -141,12 +141,15 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
            gBrowser.loadTabs(urls, {
              inBackground,
              replace,
-@@ -705,7 +716,16 @@
+@@ -758,6 +769,22 @@
          this._expandGroupOnDrop(draggedTab);
        }
-       this._resetTabsAfterDrop(draggedTab.ownerDocument);
--
-+      if (!dt.mozUserCancelled && dt.dropEffect == "none" && !this._isCustomizing) {
+       this._resetTabsAfterDrop(draggedTab);
++      if (
++        !dt.mozUserCancelled &&
++        dt.dropEffect == "none" &&
++        !this._tabbrowserTabs._isCustomizing
++      ) {
 +        const moved = gZenViewSplitter.moveTabToSplitView(event, draggedTab);
 +        if (moved) {
 +          delete draggedTab._dragData;
@@ -154,12 +157,14 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
 +        }
 +      } else if (dt.mozUserCancelled) {
 +        gZenViewSplitter.onBrowserDragEndToSplit(event, true);
-+        if (gZenViewSplitter._lastOpenedTab) gZenViewSplitter._lastOpenedTab._visuallySelected = false;
++        if (gZenViewSplitter._lastOpenedTab) {
++          gZenViewSplitter._lastOpenedTab._visuallySelected = false;
++        }
 +      }
+ 
        if (
          dt.mozUserCancelled ||
-         dt.dropEffect != "none" ||
-@@ -927,11 +947,10 @@
+@@ -1088,11 +1115,10 @@
          return this.#getHorizontalScrollboxDragTarget(event, ignoreSides);
        }
        while (target) {
@@ -175,7 +180,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
            break;
          }
          target = target.parentNode;
-@@ -961,6 +980,9 @@
+@@ -1122,6 +1148,9 @@
            return null;
          }
        }
@@ -185,17 +190,43 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
        return target;
      }
  
-@@ -1014,7 +1036,8 @@
-         isTabGroupLabel(draggedTab) &&
-         draggedTab._dragData?.expandGroupOnDrop
-       ) {
--        draggedTab.group.collapsed = false;
-+        draggedTab.group.collapsed = draggedTab.group.hasAttribute("has-active");
-+        gZenFolders.animateGroupMove(draggedTab.group, true);
-       }
+@@ -1188,17 +1217,24 @@
+       let periphery = draggedTab.ownerDocument.getElementById(
+         "tabbrowser-arrowscrollbox-periphery"
+       );
+-      // The group's tabs animate back to their full size, so hold on to the
+-      // space reserved for them until they get there.
+-      group.addEventListener(
+-        "TabGroupAnimationComplete",
+-        () => {
+-          group.collapsedByDrag = false;
+-          this.#releaseSpaceInScrolledContent(periphery);
+-        },
+-        { once: true }
+-      );
+-      group.collapsed = false;
++      const expand = !group.hasAttribute("has-active");
++      if (expand) {
++        // The group's tabs animate back to their full size, so hold on to the
++        // space reserved for them until they get there.
++        group.addEventListener(
++          "TabGroupAnimationComplete",
++          () => {
++            group.collapsedByDrag = false;
++            this.#releaseSpaceInScrolledContent(periphery);
++          },
++          { once: true }
++        );
++      } else {
++        group.collapsedByDrag = false;
++        this.#releaseSpaceInScrolledContent(periphery);
++      }
++      group.collapsed = !expand;
++      gZenFolders.animateGroupMove(group, true);
      }
  
-@@ -1206,7 +1229,6 @@
+     /**
+@@ -1380,7 +1416,6 @@
          // using updateDragImage. On Linux, we can use a panel.
          if (platform == "win" || platform == "macosx") {
            captureListener = function () {
@@ -203,7 +234,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
            };
          } else {
            // Create a panel to use it in setDragImage
-@@ -1244,7 +1266,6 @@
+@@ -1418,7 +1453,6 @@
          );
          dragImageOffset = dragImageOffset * scale;
        }
@@ -211,7 +242,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
  
        // _dragData.offsetX/Y give the coordinates that the mouse should be
        // positioned relative to the corner of the new window created upon
-@@ -1263,7 +1284,7 @@
+@@ -1437,7 +1471,7 @@
        let dropEffect = this.getDropEffectForTabDrag(event);
        let isMovingInTabStrip = !fromTabList && dropEffect == "move";
        let collapseTabGroupDuringDrag =
@@ -220,7 +251,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
  
        tab._dragData = {
          offsetX: this._tabbrowserTabs.verticalMode
-@@ -1273,7 +1294,7 @@
+@@ -1447,7 +1481,7 @@
            ? event.screenY - window.screenY - tabOffset
            : event.screenY - window.screenY,
          scrollPos:
@@ -229,7 +260,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
              ? this._tabbrowserTabs.pinnedTabsContainer.scrollPosition
              : this._tabbrowserTabs.arrowScrollbox.scrollPosition,
          screenX: event.screenX,
-@@ -1320,6 +1341,7 @@
+@@ -1540,6 +1574,7 @@
        if (tabStripItemElement.hasAttribute("dragtarget")) {
          return;
        }
@@ -237,7 +268,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
        let isPinned = tab.pinned;
        let dragAndDropElements = this._tabbrowserTabs.dragAndDropElements;
        let isGrid = this._tabbrowserTabs.isContainerVerticalPinnedGrid(tab);
-@@ -1686,23 +1708,6 @@
+@@ -1913,23 +1948,6 @@
  
        // Slide the relevant tabs to their new position.
        // non-moving tabs adjust for RTL
@@ -261,7 +292,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
        // moving tabs don't adjust for RTL
        for (let item of selectedElements) {
          if (
-@@ -1751,7 +1756,6 @@
+@@ -1978,7 +1996,6 @@
        for (let item of this._tabbrowserTabs.dragAndDropElements) {
          delete item._moveTogetherSelectedTabsData;
          item = elementToMove(item);
@@ -269,7 +300,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
          item.removeAttribute("multiselected-move-together");
        }
      }
-@@ -2598,7 +2602,6 @@
+@@ -2830,7 +2847,6 @@
          tab.style.top = "";
          tab.style.maxWidth = "";
          tab.style.pointerEvents = "";
@@ -277,7 +308,7 @@ index 8bb1219962a1368f50b53c61041f135c68e35f31..8e72441d26883cbef7a352b00c0fe2b1
          tab.removeAttribute("small-stack");
          tab.removeAttribute("big-stack");
        }
-@@ -2607,11 +2610,9 @@
+@@ -2839,11 +2855,9 @@
        )) {
          label.style.width = "";
          label.style.maxWidth = "";

src/browser/components/tabbrowser/content/tabgroup-js.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/components/tabbrowser/content/tabgroup.js b/browser/components/tabbrowser/content/tabgroup.js
-index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e356c9f8c6f 100644
+index 237950fb2c449ce088c204d33a70b1d95dae549b..635f9dbc5c79b6bb869b4ab4ec2d4b4e226b4672 100644
 --- a/browser/components/tabbrowser/content/tabgroup.js
 +++ b/browser/components/tabbrowser/content/tabgroup.js
 @@ -14,11 +14,11 @@
@@ -101,7 +101,7 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
  
      resetDefaultGroupName = () => {
        this.#defaultGroupName = "";
-@@ -175,10 +198,15 @@
+@@ -175,10 +198,18 @@
        if (!this.#tabChangeObserver) {
          this.#tabChangeObserver = new window.MutationObserver(mutations => {
            if (!this.tabs.length) {
@@ -112,12 +112,15 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
                new CustomEvent("TabGroupRemoved", { bubbles: true })
              );
 +          gZenVerticalTabsManager.animateItemClose(this).then(() => {
++            this.dispatchEvent(
++              new CustomEvent("TabGroupRemovedFromDOM", { bubbles: true })
++            );
              this.remove();
 +          });
              Services.obs.notifyObservers(
                this,
                "browser-tabgroup-removed-from-dom"
-@@ -223,7 +251,10 @@
+@@ -223,7 +254,10 @@
            }
          });
        }
@@ -129,7 +132,7 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
      }
  
      get color() {
-@@ -330,6 +361,9 @@
+@@ -330,6 +364,9 @@
      }
  
      set collapsed(val) {
@@ -139,7 +142,7 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
        if (!!val == this.collapsed) {
          return;
        }
-@@ -416,7 +450,6 @@
+@@ -416,7 +453,6 @@
            tabGroupName,
          })
          .then(result => {
@@ -147,7 +150,7 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
          });
      }
  
-@@ -491,13 +524,68 @@
+@@ -491,13 +527,68 @@
       * @returns {MozTabbrowserTab[]}
       */
      get tabs() {
@@ -162,9 +165,8 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
 +        tabsCollect.push(item);
 +        if (gBrowser.isTabGroup(item)) {
 +          tabsCollect.push(...item.tabs);
-         }
-       }
--      return childrenArray.filter(node => node.matches("tab"));
++        }
++      }
 +      return tabsCollect.filter(node => node.matches("tab"));
 +    }
 +
@@ -208,8 +210,9 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
 +        currentGroup = currentGroup?.group;
 +        if (currentGroup.collapsed) {
 +          return false;
-+        }
-+      }
+         }
+       }
+-      return childrenArray.filter(node => node.matches("tab"));
 +      if (this.pinned && gZenWorkspaces.activeWorkspaceElement?.hasCollapsedPinnedTabs) {
 +        return false;
 +      }
@@ -221,7 +224,7 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
      }
  
      /**
-@@ -617,9 +705,6 @@
+@@ -617,9 +708,6 @@
            });
          } else {
            if (tabOrSplitView.pinned) {
@@ -231,7 +234,7 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
            }
            let tabToMove =
              this.documentGlobal === tabOrSplitView.documentGlobal
-@@ -682,7 +767,7 @@
+@@ -682,7 +770,7 @@
       */
      on_click(event) {
        let isToggleElement =
@@ -240,7 +243,7 @@ index 237950fb2c449ce088c204d33a70b1d95dae549b..af200a043dcd2e24393fcefe32493e35
          event.target === this.#overflowCountLabel;
        if (isToggleElement && event.button === 0) {
          event.preventDefault();
-@@ -761,5 +846,6 @@
+@@ -761,5 +849,6 @@
      }
    }
  

src/browser/components/urlbar/UrlbarPrefs-sys-mjs.patch

@@ -1,8 +1,8 @@
 diff --git a/browser/components/urlbar/UrlbarPrefs.sys.mjs b/browser/components/urlbar/UrlbarPrefs.sys.mjs
-index 89f0d44d462de3d7d0f581d6371606f475443822..0d45ce5f6455e9c7276c54f504906bade5b3d286 100644
+index e48f0295d803ba9eac5ab9d01ebb3b3dacbc9d4b..cb78b74230f63a47479404767b5ab5883278dfba 100644
 --- a/browser/components/urlbar/UrlbarPrefs.sys.mjs
 +++ b/browser/components/urlbar/UrlbarPrefs.sys.mjs
-@@ -163,6 +163,9 @@ const PREF_URLBAR_DEFAULTS = /** @type {PreferenceDefinition[]} */ ([
+@@ -161,6 +161,9 @@ const PREF_URLBAR_DEFAULTS = /** @type {PreferenceDefinition[]} */ ([
    // Feature gate pref for flight status suggestions in the urlbar.
    ["flightStatus.featureGate", false],
  
@@ -12,7 +12,7 @@ index 89f0d44d462de3d7d0f581d6371606f475443822..0d45ce5f6455e9c7276c54f504906bad
    // The minimum prefix length of a flight status keyword the user must type to
    // trigger the suggestion. 0 means the min length should be taken from Nimbus
    // or remote settings.
-@@ -482,6 +485,7 @@ const PREF_URLBAR_DEFAULTS = /** @type {PreferenceDefinition[]} */ ([
+@@ -486,6 +489,7 @@ const PREF_URLBAR_DEFAULTS = /** @type {PreferenceDefinition[]} */ ([
    ["shortcuts.tabs", true],
    ["shortcuts.history", true],
    ["shortcuts.actions", true],
@@ -20,12 +20,12 @@ index 89f0d44d462de3d7d0f581d6371606f475443822..0d45ce5f6455e9c7276c54f504906bad
  
    // Boolean to determine if the providers defined in `exposureResults`
    // should be displayed in search results. This can be set by a
-@@ -840,6 +844,8 @@ function makeDefaultResultGroups({
+@@ -854,6 +858,8 @@ function makeDefaultResultGroups({
     */
    let rootGroup = {
      children: [
-+      { children: [{ group: lazy.UrlbarUtils.RESULT_GROUP.ZEN_ACTION }] },
-+      { children: [{ group: lazy.UrlbarUtils.RESULT_GROUP.ZEN_WORKSPACE }] },
++      { children: [{ group: lazy.UrlbarShared.RESULT_GROUP.ZEN_ACTION }] },
++      { children: [{ group: lazy.UrlbarShared.RESULT_GROUP.ZEN_WORKSPACE }] },
        // heuristic
        {
          maxResultCount: 1,

src/browser/components/urlbar/UrlbarProviderHeuristicFallback-sys-mjs.patch

@@ -1,15 +1,15 @@
 diff --git a/browser/components/urlbar/UrlbarProviderHeuristicFallback.sys.mjs b/browser/components/urlbar/UrlbarProviderHeuristicFallback.sys.mjs
-index f611d8e44af518aa1adc7505c5021235f55b49de..0eca20cb869626dfa6ace02acc00cad84462d54f 100644
+index e32b02941a6019703212cede4660a24b88845120..5cb363ed20d49c1ae8abedecc3b08540406b7a1b 100644
 --- a/browser/components/urlbar/UrlbarProviderHeuristicFallback.sys.mjs
 +++ b/browser/components/urlbar/UrlbarProviderHeuristicFallback.sys.mjs
-@@ -78,22 +78,26 @@ export class UrlbarProviderHeuristicFallback extends UrlbarProvider {
+@@ -76,22 +76,26 @@ export class UrlbarProviderHeuristicFallback extends UrlbarProvider {
          // Since we can't tell if this is a real URL and whether the user wants
          // to visit or search for it, we provide an alternative searchengine
          // match if the string looks like an alphanumeric origin or an e-mail.
 -        let str = queryContext.searchString;
 -        if (!URL.canParse(str)) {
 -          if (
--            lazy.UrlbarPrefs.get("keyword.enabled") &&
+-            queryContext.keywordEnabled &&
 -            (lazy.UrlUtils.looksLikeOrigin(str, {
 -              noIp: true,
 -              noPort: true,
@@ -17,14 +17,14 @@ index f611d8e44af518aa1adc7505c5021235f55b49de..0eca20cb869626dfa6ace02acc00cad8
 -              lazy.UrlUtils.REGEXP_COMMON_EMAIL.test(str))
 -          ) {
 +        let trimmedSearchString = queryContext.trimmedSearchString;
-+        let [searchCandidate] = UrlbarUtils.stripPrefixAndTrim(
++        let [searchCandidate] = lazy.UrlbarShared.stripPrefixAndTrim(
 +          trimmedSearchString,
 +          {
 +            trimSlash: true,
 +           }
 +        );
 +        if (
-+          lazy.UrlbarPrefs.get("keyword.enabled") &&
++          queryContext.keywordEnabled &&
 +          (lazy.UrlUtils.looksLikeUrl(searchCandidate) ||
 +            lazy.UrlUtils.looksLikeOrigin(searchCandidate, {
 +              allowPartialNumericalTLDs: true,

src/browser/components/urlbar/UrlbarUtils-sys-mjs.patch

@@ -1,41 +0,0 @@
-diff --git a/browser/components/urlbar/UrlbarUtils.sys.mjs b/browser/components/urlbar/UrlbarUtils.sys.mjs
-index 78c76bde00b6b581184cee1cd0e1756e5f2da6a4..94c713470b1240729ef2350d090b0449f3801af4 100644
---- a/browser/components/urlbar/UrlbarUtils.sys.mjs
-+++ b/browser/components/urlbar/UrlbarUtils.sys.mjs
-@@ -126,6 +126,8 @@ export var UrlbarUtils = {
-     SEMANTIC_HISTORY: "semanticHistory",
-     SUGGESTED_INDEX: "suggestedIndex",
-     TAIL_SUGGESTION: "tailSuggestion",
-+    ZEN_ACTION: "zenAction",
-+    ZEN_WORKSPACE: "zenWorkspace",
-   }),
- 
-   // Defines provider types.
-@@ -274,6 +276,14 @@ export var UrlbarUtils = {
-         telemetryLabel: "actions",
-         uiLabel: "urlbar-searchmode-actions3",
-       },
-+      {
-+        source: UrlbarShared.RESULT_SOURCE.WORKSPACES,
-+        restrict: UrlbarShared.RESTRICT_TOKENS.WORKSPACE,
-+        icon: "chrome://browser/skin/zen-icons/selectable/layers.svg",
-+        pref: "shortcuts.workspaces",
-+        telemetryLabel: "workspaces",
-+        uiLabel: "urlbar-search-mode-workspaces",
-+      },
-     ]);
-   },
- 
-@@ -566,6 +576,12 @@ export var UrlbarUtils = {
-           return this.RESULT_GROUP.HEURISTIC_FALLBACK;
-         case "UrlbarProviderHistoryUrlHeuristic":
-           return this.RESULT_GROUP.HEURISTIC_HISTORY_URL;
-+        case "ZenUrlbarProviderGlobalActions":
-+          if (result.source == UrlbarShared.RESULT_SOURCE.WORKSPACES) {
-+            return this.RESULT_GROUP.ZEN_WORKSPACE;
-+          } else {
-+            return this.RESULT_GROUP.ZEN_ACTION;
-+          }
-         case "UrlbarProviderOmnibox":
-           return this.RESULT_GROUP.HEURISTIC_OMNIBOX;
-         case "UrlbarProviderRestrictKeywordsAutofill":

src/browser/components/urlbar/content/UrlbarChildController-mjs.patch

@@ -1,16 +1,16 @@
 diff --git a/browser/components/urlbar/content/UrlbarChildController.mjs b/browser/components/urlbar/content/UrlbarChildController.mjs
-index a8e9d3093d046612650a17970330a8279f55833f..063a3e8adf009d6c0ddc60430bc0e7485e812b8a 100644
+index 52ed36deac35d3de9f7f537313159fb4debe98a6..3bbc612a2e10eedafdabdaa8e17cf36831a6a27c 100644
 --- a/browser/components/urlbar/content/UrlbarChildController.mjs
 +++ b/browser/components/urlbar/content/UrlbarChildController.mjs
-@@ -258,7 +258,6 @@ export class UrlbarChildController {
-     const isMac = AppConstants.platform == "macosx";
+@@ -446,7 +446,6 @@ export class UrlbarChildController {
+     const isMac = UrlbarContentUtils.getPlatform() == "macosx";
      // Handle readline/emacs-style navigation bindings on Mac.
      if (
 -      isMac &&
        this.view.isOpen &&
        event.ctrlKey &&
        (event.key == "n" || event.key == "p")
-@@ -450,6 +449,8 @@ export class UrlbarChildController {
+@@ -644,6 +643,8 @@ export class UrlbarChildController {
              });
            }
            event.preventDefault();
@@ -19,3 +19,25 @@ index a8e9d3093d046612650a17970330a8279f55833f..063a3e8adf009d6c0ddc60430bc0e748
          }
          break;
        }
+@@ -905,6 +906,10 @@ export class UrlbarChildController {
+       }
+       reuseEmpty = true;
+     }
++    if (this.#input.hasAttribute?.("zen-newtab")) {
++      where = "tab";
++      reuseEmpty = true;
++    }
+     // The browser window exists only in chrome; a content-process input has no
+     // tab to reuse, so `gBrowser` is absent and the reuse is skipped.
+     if (
+@@ -914,6 +919,10 @@ export class UrlbarChildController {
+     ) {
+       where = "current";
+     }
++    if (this.window.gBrowser?.selectedTab.hasAttribute("zen-empty-tab")) {
++      // Always open in a new tab if the current tab is our empty tab.
++      return "tab";
++    }
+     return where;
+   }
+ 

src/browser/components/urlbar/content/UrlbarInputBase-mjs.patch

@@ -1,22 +1,21 @@
-diff --git a/browser/components/urlbar/content/UrlbarInput.mjs b/browser/components/urlbar/content/UrlbarInput.mjs
-index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c396406a247e9 100644
---- a/browser/components/urlbar/content/UrlbarInput.mjs
-+++ b/browser/components/urlbar/content/UrlbarInput.mjs
-@@ -101,6 +101,13 @@ const lazy = XPCOMUtils.declareLazy({
-   logger: () => UrlbarShared.getLogger({ prefix: "Input" }),
- });
+diff --git a/browser/components/urlbar/content/UrlbarInputBase.mjs b/browser/components/urlbar/content/UrlbarInputBase.mjs
+index 8be35b58c5369e123ca69426e852e3849bf75513..778d8aecce4da6748ecbf8b86a38c2da6e01bec5 100644
+--- a/browser/components/urlbar/content/UrlbarInputBase.mjs
++++ b/browser/components/urlbar/content/UrlbarInputBase.mjs
+@@ -83,6 +83,12 @@ if (lazy) {
+       Ci.nsIURLQueryStringStripper,
+     ],
+   });
++  XPCOMUtils.defineLazyPreferenceGetter(
++    lazy,
++    "ZEN_URLBAR_BEHAVIOR",
++    "zen.urlbar.behavior",
++    'default'
++  );
+ }
  
-+XPCOMUtils.defineLazyPreferenceGetter(
-+  lazy,
-+  "ZEN_URLBAR_BEHAVIOR",
-+  "zen.urlbar.behavior",
-+  'default'
-+);
-+
- const UNLIMITED_MAX_RESULTS = 99;
- 
- let getBoundsWithoutFlushing = element =>
-@@ -769,7 +776,16 @@ ${
+ const logger = () => UrlbarShared.getLogger({ prefix: "Input" });
+@@ -917,7 +923,16 @@ ${
      // See _on_select().  HTMLInputElement.select() dispatches a "select"
      // event but does not set the primary selection.
      this._suppressPrimaryAdjustment = true;
@@ -33,7 +32,7 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      this._suppressPrimaryAdjustment = false;
    }
  
-@@ -843,6 +859,10 @@ ${
+@@ -992,6 +1007,10 @@ ${
      hideSearchTerms = false,
      isSameDocument = false,
    } = {}) {
@@ -44,7 +43,7 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      if (!this.#isAddressbar) {
        throw new Error(
          "Cannot set URI for UrlbarInput that is not an address bar"
-@@ -1137,7 +1157,16 @@ ${
+@@ -1289,7 +1308,16 @@ ${
        this.searchModeSwitcher?.updateSearchIcon();
      }
  
@@ -61,7 +60,17 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
    }
  
    /**
-@@ -1626,7 +1655,11 @@ ${
+@@ -1401,6 +1429,9 @@ ${
+       where,
+       query: searchString,
+     });
++    if (where != "current" && this.sapName != "searchbar") {
++      this.handleRevert();
++    }
+     this.controller.openSERP(
+       engine.id,
+       searchString,
+@@ -1884,7 +1915,11 @@ ${
      openParams.avoidBrowserFocus = keepViewOpen;
  
      if (!this.#providesSearchMode(result) && !keepViewOpen) {
@@ -74,12 +83,12 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      }
  
      if (isCanonized) {
-@@ -2974,6 +3007,42 @@ ${
+@@ -3181,6 +3216,42 @@ ${
      await this.#updateLayoutBreakoutDimensions();
    }
  
 +  zenFormatURLValue() {
-+    return this.#lazy.valueFormatter._formatURL();
++    return this.#getValueFormatter().update();
 +  }
 +
 +  get zenUrlbarBehavior() {
@@ -117,8 +126,11 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
    startLayoutExtend() {
      if (!this.#allowBreakout || this.hasAttribute("breakout-extend")) {
        // Do not expand if the Urlbar does not support being expanded or it is
-@@ -2988,6 +3057,13 @@ ${
+@@ -3193,8 +3264,16 @@ ${
+     }
+ 
      this.toggleAttribute("breakout-extend", true);
++    this.#showBreakoutPopover();
      this.#updateTextboxPosition();
  
 +    this.window.gZenUIManager.onUrlbarOpen();
@@ -131,7 +143,7 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      // Enable the animation only after the first extend call to ensure it
      // doesn't run when opening a new window.
      if (!this.hasAttribute("breakout-extend-animate")) {
-@@ -3011,6 +3087,29 @@ ${
+@@ -3218,7 +3297,33 @@ ${
        return;
      }
  
@@ -159,9 +171,13 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
 +    this.removeAttribute("zen-floating-urlbar");
 +
      this.toggleAttribute("breakout-extend", false);
++    if (this.#isAddressbar) {
++      this.#hideBreakoutPopover();
++    }
      this.#updateTextboxPosition();
    }
-@@ -3049,7 +3148,7 @@ ${
+ 
+@@ -3256,7 +3361,7 @@ ${
      forceUnifiedSearchButtonAvailable = false
    ) {
      let prevState = this.getAttribute("pageproxystate");
@@ -170,20 +186,51 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      this.setAttribute("pageproxystate", state);
      this._inputContainer.setAttribute("pageproxystate", state);
      this._identityBox?.setAttribute("pageproxystate", state);
-@@ -3332,10 +3431,12 @@ ${
+@@ -3533,7 +3638,11 @@ ${
+       return;
      }
  
-     this.style.top = px(
+-    this.style.top = px(getUntransformedTop(this.parentNode));
++    this.style.top = px(
 +      this.window.gZenVerticalTabsManager._hasSetSingleToolbar ?
-       this.parentNode.getBoxQuads({
-         ignoreTransforms: true,
-         flush: false,
-       })[0].p1.y
-+      : (AppConstants.platform == "macosx" ? -2 : -5)
-     );
++      getUntransformedTop(this.parentNode)
++      : (UrlbarContentUtils.getPlatform() == "macosx" ? -2 : -5)
++    );
    }
  
-@@ -3394,9 +3495,10 @@ ${
+   #updateTextboxPositionNextFrame() {
+@@ -3553,12 +3662,29 @@ ${
+     this.removeAttribute("breakout");
+     this.parentNode.removeAttribute("breakout");
+     this.style.top = "";
++    this.#hideBreakoutPopover();
++    this._layoutBreakoutUpdateKey = {};
++  }
++
++  #showBreakoutPopover() {
++    if (this.#isAddressbar) {
++      this.setAttribute("popover", "manual");
++    }
++    if (!this.matches(":popover-open")) {
++      this.showPopover();
++    }
++    this.#fixAddressbarSearchbarOrder();
++  }
++
++  #hideBreakoutPopover() {
+     try {
+       this.hidePopover();
+     } catch (ex) {
+       // No big deal if not a popover already.
+     }
+-    this._layoutBreakoutUpdateKey = {};
++    if (this.#isAddressbar) {
++      this.removeAttribute("popover");
++    }
+   }
+ 
+   incrementBreakoutBlockerCount() {
+@@ -3591,9 +3717,10 @@ ${
            return;
          }
  
@@ -193,9 +240,21 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
 -          px(getBoundsWithoutFlushing(this.parentNode).height)
 +          px(getBoundsWithoutFlushing(this.parentNode).height + 8)
          );
-         this.style.setProperty(
-           "--urlbar-height",
-@@ -3902,6 +4004,7 @@ ${
+ 
+         if (this.#breakoutBlockerCount) {
+@@ -3602,8 +3729,9 @@ ${
+ 
+         this.setAttribute("breakout", "true");
+         this.parentNode.setAttribute("breakout", "true");
+-        this.showPopover();
+-        this.#fixAddressbarSearchbarOrder();
++        if (!this.#isAddressbar || this.hasAttribute("breakout-extend")) {
++          this.#showBreakoutPopover();
++        }
+         this.#updateTextboxPosition();
+ 
+         resolve();
+@@ -4108,6 +4236,7 @@ ${
    }
  
    _toggleActionOverride(event) {
@@ -203,63 +262,49 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      if (
        event.keyCode == KeyEvent.DOM_VK_SHIFT ||
        event.keyCode == KeyEvent.DOM_VK_ALT ||
-@@ -4014,8 +4117,8 @@ ${
+@@ -4206,9 +4335,10 @@ ${
      if (!this.#isAddressbar) {
        return val;
      }
--    let trimmedValue = lazy.UrlbarPrefs.get("trimURLs")
+-    let trimmedValue = UrlbarPrefs.get("trimURLs")
 -      ? lazy.BrowserUIUtils.trimURL(val)
-+    let trimmedValue = lazy.UrlbarPrefs.get("trimURLs") && this._zenTrimURL
-+      ? this._zenTrimURL(val)
-       : val;
+-      : val;
++    let trimmedValue =
++      UrlbarPrefs.get("trimURLs") && this._zenTrimURL
++        ? this._zenTrimURL(val)
++        : val;
      // Only trim value if the directionality doesn't change to RTL and we're not
      // showing a strikeout https protocol.
-@@ -4317,6 +4420,7 @@ ${
-     browser = this.window.gBrowser.selectedBrowser,
-     keepViewOpen = false
-   ) {
-+    openUILinkWhere = this.window.gZenUIManager.getOpenUILinkWhere(url, browser, openUILinkWhere);
-     if (this.#isAddressbar) {
-       this.#prepareAddressbarLoad(
-         url,
-@@ -4430,6 +4534,10 @@ ${
-       }
-       reuseEmpty = true;
-     }
-+    if (this.hasAttribute("zen-newtab")) {
-+      where = "tab";
-+      reuseEmpty = true;
-+    }
+     return UrlbarContentUtils.isTextDirectionRTL(trimmedValue, window) ||
+@@ -4410,6 +4540,11 @@ ${
+     keepViewOpen = false,
+     browserId = null,
+   }) {
++    where = this.window.gZenUIManager.getOpenUILinkWhere(
++      loadRequest.urlLoad?.url ?? "",
++      this.window.gBrowser.selectedBrowser,
++      where
++    );
+     let keyDownEnterDeferred;
      if (
-       where == "tab" &&
-       reuseEmpty &&
-@@ -4437,6 +4545,9 @@ ${
-     ) {
-       where = "current";
-     }
-+    if (this.window.gBrowser.selectedTab.hasAttribute("zen-empty-tab")) {
-+      return "tab"; // Always open in a new tab if the current tab is "our empty tab".
-+    }
-     return where;
-   }
+       this._keyDownEnterDeferred &&
+@@ -4731,6 +4866,7 @@ ${
+           this.setResultForCurrentValue(null);
+           this.handleCommand();
+           this.controller.clearLastQueryContextCache();
++          this.view.close();
  
-@@ -4691,6 +4802,7 @@ ${
-       this.setResultForCurrentValue(null);
-       this.handleCommand();
-       this.controller.clearLastQueryContextCache();
-+      this.view.close();
+           this._suppressStartQuery = false;
+         });
+@@ -4742,7 +4878,6 @@ ${
+         // Close the results pane, because paste and go doesn't want a result
+         // selection. This has to happen before the menu opens: ending
+         // breakout-extend once it's open keeps it from showing (bug 2037468).
+-        this.view.close();
  
-       this._suppressStartQuery = false;
-     });
-@@ -4698,7 +4810,6 @@ ${
-     contextMenu.addEventListener("popupshowing", () => {
-       // Close the results pane when the input field contextual menu is open,
-       // because paste and go doesn't want a result selection.
--      this.view.close();
- 
-       let controller =
-         this.document.commandDispatcher.getControllerForCommand("cmd_paste");
-@@ -4979,7 +5090,11 @@ ${
+         let controller =
+           this.document.commandDispatcher.getControllerForCommand("cmd_paste");
+@@ -5025,7 +5160,11 @@ ${
      if (!engineName && !source && !this.hasAttribute("searchmode")) {
        return;
      }
@@ -272,7 +317,7 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      if (this._searchModeIndicatorTitle) {
        this._searchModeIndicatorTitle.textContent = "";
        this._searchModeIndicatorTitle.removeAttribute("data-l10n-id");
-@@ -5297,6 +5412,7 @@ ${
+@@ -5335,6 +5474,7 @@ ${
  
      this.document.l10n.setAttributes(
        this.inputField,
@@ -280,20 +325,20 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
        l10nId,
        l10nId == "urlbar-placeholder-with-name"
          ? { name: engineName }
-@@ -5347,6 +5463,12 @@ ${
+@@ -5385,6 +5525,12 @@ ${
      }
  
-     lazy.logger.debug("Blur Event");
+     logger().debug("Blur Event");
 +    if (
 +      this.document.commandDispatcher.focusedElement == this.inputField &&
-+      !lazy.UrlbarPrefs.get("closeOnWindowBlur")
++      !UrlbarPrefs.get("closeOnWindowBlur")
 +    ) {
 +      return;
 +    }
      // We cannot count every blur events after a missed engagement as abandoment
      // because the user may have clicked on some view element that executes
      // a command causing a focus change. For example opening preferences from
-@@ -5424,6 +5546,11 @@ ${
+@@ -5464,6 +5610,11 @@ ${
    }
  
    _on_click(event) {
@@ -305,7 +350,7 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
      switch (event.target) {
        case this.inputField:
        case this._inputContainer:
-@@ -5513,10 +5640,11 @@ ${
+@@ -5558,10 +5709,11 @@ ${
        }
        if (untrim) {
          this.setValue(this._untrimmedValue);
@@ -318,7 +363,7 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
        this.view.autoOpen({ event });
      } else {
        if (this._untrimOnFocusAfterKeydown) {
-@@ -5556,9 +5684,16 @@ ${
+@@ -5605,9 +5757,16 @@ ${
    }
  
    _on_mousedown(event) {
@@ -336,7 +381,7 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
          if (
            event.composedTarget != this.inputField &&
            event.composedTarget != this._inputContainer
-@@ -5568,6 +5703,10 @@ ${
+@@ -5617,6 +5776,10 @@ ${
  
          this.focusedViaMousedown = !this.focused;
          this.#preventClickSelectsAll = this.focused;
@@ -347,21 +392,21 @@ index e7e9495e56076cd112beafb8297dece4ae4cea58..95e4333866a5f0d41fbdbe23910c3964
  
          // Keep the focus status, since the attribute may be changed
          // upon calling this.focus().
-@@ -5605,7 +5744,7 @@ ${
+@@ -5654,7 +5817,7 @@ ${
          // view open on tab switch, and the TabSelect event arrived earlier.
          // Also ignore mousedown on the urlbarView context menu: opening/closing the
          // view is already handled by the result opening flow.
 -        if (event.target.closest?.("tab, #urlbarView-context-menu")) {
-+        if (event.target.closest?.("tab, #urlbarView-context-menu") || event.target.closest?.("#tabs-newtab-button")) {
++        if (event.target.closest?.("tab, #urlbarView-context-menu") || event.target.closest?.("menupopup") || event.target.closest?.("#tabs-newtab-button")) {
            break;
          }
  
-@@ -5894,7 +6033,7 @@ ${
+@@ -5948,7 +6111,7 @@ ${
      // When we are in actions search mode we can show more results so
      // increase the limit.
      let maxResults =
 -      this.searchMode?.source != UrlbarShared.RESULT_SOURCE.ACTIONS
 +      this.searchMode?.source != UrlbarShared.RESULT_SOURCE.ZEN_ACTIONS
-         ? lazy.UrlbarPrefs.get("maxRichResults")
+         ? UrlbarPrefs.get("maxRichResults")
          : UNLIMITED_MAX_RESULTS;
      let options = {

src/browser/components/urlbar/content/UrlbarShared-mjs.patch

@@ -1,8 +1,8 @@
 diff --git a/browser/components/urlbar/content/UrlbarShared.mjs b/browser/components/urlbar/content/UrlbarShared.mjs
-index 5b45afb747bfcdbd06782186737669aa2c4c634d..f68bd009f70415b5fb513abdfe19b4427ceefbfc 100644
+index 0ac5330223c84fbb98880a5c2d83ae58a8f3079e..ff488cf5a2c8b7857a8e145e40aaf861cfa655ec 100644
 --- a/browser/components/urlbar/content/UrlbarShared.mjs
 +++ b/browser/components/urlbar/content/UrlbarShared.mjs
-@@ -47,6 +47,7 @@ export const UrlbarShared = {
+@@ -158,6 +158,7 @@ export const UrlbarShared = {
      // `looksLikeOrigin()` returned `LOOKS_LIKE_ORIGIN.OTHER` for this token.
      // It may or may not be an origin.
      POSSIBLE_ORIGIN_BUT_SEARCH_ALLOWED: 12,
@@ -10,7 +10,7 @@ index 5b45afb747bfcdbd06782186737669aa2c4c634d..f68bd009f70415b5fb513abdfe19b442
    }),
  
    /**
-@@ -67,6 +68,7 @@ export const UrlbarShared = {
+@@ -178,6 +179,7 @@ export const UrlbarShared = {
      TITLE: "#",
      URL: "$",
      ACTION: ">",
@@ -18,7 +18,7 @@ index 5b45afb747bfcdbd06782186737669aa2c4c634d..f68bd009f70415b5fb513abdfe19b442
    }),
  
    // Defines UrlbarResult types.
-@@ -112,6 +114,8 @@ export const UrlbarShared = {
+@@ -223,6 +225,8 @@ export const UrlbarShared = {
      OTHER_NETWORK: 6,
      ADDON: 7,
      ACTIONS: 8,
@@ -26,12 +26,56 @@ index 5b45afb747bfcdbd06782186737669aa2c4c634d..f68bd009f70415b5fb513abdfe19b442
 +    WORKSPACES: 10,
    }),
  
-   /**
-@@ -128,6 +132,7 @@ export const UrlbarShared = {
-     if (lazy.UrlbarPrefs.get("scotchBonnet.enableOverride")) {
+   // Results are categorized into groups to help the muxer compose them.  See
+@@ -258,6 +262,8 @@ export const UrlbarShared = {
+     SEMANTIC_HISTORY: "semanticHistory",
+     SUGGESTED_INDEX: "suggestedIndex",
+     TAIL_SUGGESTION: "tailSuggestion",
++    ZEN_ACTION: "zenAction",
++    ZEN_WORKSPACE: "zenWorkspace",
+   }),
+ 
+   // Defines provider types.
+@@ -443,6 +449,14 @@ export const UrlbarShared = {
+         telemetryLabel: "actions",
+         uiLabel: "urlbar-searchmode-actions3",
+       },
++      {
++        source: this.RESULT_SOURCE.WORKSPACES,
++        restrict: this.RESTRICT_TOKENS.WORKSPACE,
++        icon: "chrome://browser/skin/zen-icons/selectable/layers.svg",
++        pref: "shortcuts.workspaces",
++        telemetryLabel: "workspaces",
++        uiLabel: "urlbar-search-mode-workspaces",
++      },
+     ]);
+   },
+ 
+@@ -460,6 +474,7 @@ export const UrlbarShared = {
+     if (UrlbarPrefs.get("scotchBonnet.enableOverride")) {
        keys.push(this.RESTRICT_TOKENS.ACTION);
      }
 +    keys.push(this.RESTRICT_TOKENS.WORKSPACE);
      return new Set(keys);
    },
  
+@@ -1032,6 +1047,11 @@ export const UrlbarShared = {
+           return UrlbarShared.RESULT_GROUP.HEURISTIC_FALLBACK;
+         case "UrlbarProviderHistoryUrlHeuristic":
+           return UrlbarShared.RESULT_GROUP.HEURISTIC_HISTORY_URL;
++        case "ZenUrlbarProviderGlobalActions":
++          if (result.source == UrlbarShared.RESULT_SOURCE.WORKSPACES) {
++            return UrlbarShared.RESULT_GROUP.ZEN_WORKSPACE;
++          }
++          return UrlbarShared.RESULT_GROUP.ZEN_ACTION;
+         case "UrlbarProviderOmnibox":
+           return UrlbarShared.RESULT_GROUP.HEURISTIC_OMNIBOX;
+         case "UrlbarProviderRestrictKeywordsAutofill":
+@@ -1060,6 +1080,7 @@ export const UrlbarShared = {
+       case "UrlbarProviderAboutPages":
+         return UrlbarShared.RESULT_GROUP.ABOUT_PAGES;
+       case "UrlbarProviderInputHistory":
++      case "ZenUrlbarProviderSidebar":
+         return UrlbarShared.RESULT_GROUP.INPUT_HISTORY;
+       case "UrlbarProviderQuickSuggest":
+         return UrlbarShared.RESULT_GROUP.GENERAL_PARENT;

src/browser/components/urlbar/content/UrlbarView-mjs.patch

@@ -1,8 +1,8 @@
 diff --git a/browser/components/urlbar/content/UrlbarView.mjs b/browser/components/urlbar/content/UrlbarView.mjs
-index e465806c4ae4fc372d9aa2b71aa7f0e74c65d026..c0b3781901298bedee2736819a93edbf545507a7 100644
+index 9a2c787cfa4d70bd587d49e017075f905c90f626..1c3b341e5d520ec9541c4021aaedce98751b6993 100644
 --- a/browser/components/urlbar/content/UrlbarView.mjs
 +++ b/browser/components/urlbar/content/UrlbarView.mjs
-@@ -803,7 +803,7 @@ export class UrlbarView {
+@@ -822,7 +822,7 @@ export class UrlbarView {
        !this.input.value ||
        this.input.getAttribute("pageproxystate") == "valid"
      ) {
@@ -11,7 +11,7 @@ index e465806c4ae4fc372d9aa2b71aa7f0e74c65d026..c0b3781901298bedee2736819a93edbf
          // Try to reuse the cached top-sites context. If it's not cached, then
          // there will be a gap of time between when the input is focused and
          // when the view opens that can be perceived as flicker.
-@@ -941,10 +941,6 @@ export class UrlbarView {
+@@ -963,10 +963,6 @@ export class UrlbarView {
      }
  
      // If search mode isn't active, close the view.
@@ -22,7 +22,7 @@ index e465806c4ae4fc372d9aa2b71aa7f0e74c65d026..c0b3781901298bedee2736819a93edbf
  
      // Search mode is active.  If the one-offs should be shown, make sure they
      // are enabled and show the view.
-@@ -3203,6 +3199,8 @@ export class UrlbarView {
+@@ -3306,6 +3302,8 @@ export class UrlbarView {
        if (row?.hasAttribute("row-selectable")) {
          row?.toggleAttribute("selected", true);
        }
@@ -31,7 +31,7 @@ index e465806c4ae4fc372d9aa2b71aa7f0e74c65d026..c0b3781901298bedee2736819a93edbf
        if (element != row) {
          row?.toggleAttribute("descendant-selected", true);
        }
-@@ -3715,7 +3713,7 @@ export class UrlbarView {
+@@ -3972,7 +3970,7 @@ export class UrlbarView {
    }
  
    #enableOrDisableRowWrap() {
@@ -40,13 +40,13 @@ index e465806c4ae4fc372d9aa2b71aa7f0e74c65d026..c0b3781901298bedee2736819a93edbf
      this.#rows.toggleAttribute("wrap", wrap);
      this.oneOffSearchButtons?.container.toggleAttribute("wrap", wrap);
    }
-@@ -4144,6 +4142,12 @@ export class UrlbarView {
+@@ -4387,6 +4385,12 @@ export class UrlbarView {
    }
  
    on_blur() {
 +    if (
 +      this.document.commandDispatcher.focusedElement == this.input.inputField &&
-+      !lazy.UrlbarPrefs.get("closeOnWindowBlur")
++      !UrlbarPrefs.get("closeOnWindowBlur")
 +    ) {
 +      return;
 +    }

src/browser/extensions/newtab/lib/AboutPreferences-sys-mjs.patch

@@ -0,0 +1,13 @@
+diff --git a/browser/extensions/newtab/lib/AboutPreferences.sys.mjs b/browser/extensions/newtab/lib/AboutPreferences.sys.mjs
+index 4562efc05b76d5dddd35bda79bd7d5d98a51ffc9..ad9b6f55f5e77065ce74535daf6457a5c4b44058 100644
+--- a/browser/extensions/newtab/lib/AboutPreferences.sys.mjs
++++ b/browser/extensions/newtab/lib/AboutPreferences.sys.mjs
+@@ -355,7 +355,7 @@ export class AboutPreferences {
+       // Firefox 155+ registers `homepage` and `customHomepage` in
+       // components/preferences. They can't be registered twice, so skip them
+       // on 155+. Drop this condition once 155 reaches Release.
+-      if (Services.vc.compare(AppConstants.MOZ_APP_VERSION, "155.0a1") < 0) {
++      if (false) {
+         groups.homepage = this._setupHomepageGroup(window);
+         groups.customHomepage = this._setupCustomHomepageGroup(window);
+       }

src/browser/installer/windows/nsis/shared-nsh.patch

@@ -0,0 +1,124 @@
+diff --git a/browser/installer/windows/nsis/shared.nsh b/browser/installer/windows/nsis/shared.nsh
+index b81c7ef59be0d25f67668215028008a451860df2..fa0ab8947e011289d25158cab17ff9388b5cab0d 100755
+--- a/browser/installer/windows/nsis/shared.nsh
++++ b/browser/installer/windows/nsis/shared.nsh
+@@ -873,50 +873,87 @@ FunctionEnd
+ !ifdef MOZ_MAINTENANCE_SERVICE
+ ; Adds maintenance service certificate keys for the install dir.
+ ; For the cert to work, it must also be signed by a trusted cert for the user.
++; Writes this application's allowed certificate values into _KEY, which must be
++; a maintenance service registry path such as the one returned by
++; ServicesHelper::PathToUniqueRegistryPath.
++!macro AddMaintCertKeyValues _KEY
++  ; PrefetchProcessName was originally used to experiment with deleting
++  ; Windows prefetch as a speed optimization.  It is no longer used though.
++  DeleteRegValue HKLM "${_KEY}" "prefetchProcessName"
++
++  ; Setting the Attempted value will ensure that a new Maintenance Service
++  ; install will never be attempted again after this from updates.  The value
++  ; is used only to see if updates should attempt new service installs.
++  WriteRegDWORD HKLM "Software\Mozilla\MaintenanceService" "Attempted" 1
++
++  ; More than one certificate can be specified in a different subfolder
++  ; for example: ${_KEY}\1, but each individual binary can be signed
++  ; with at most one certificate.  A fallback certificate can only be used
++  ; if the binary is replaced with a different certificate.
++  WriteRegStr HKLM "${_KEY}\0" "name" "${CERTIFICATE_NAME}"
++  WriteRegStr HKLM "${_KEY}\0" "issuer" "${CERTIFICATE_ISSUER}"
++  ; These values associate the allowed certificates for the previous
++  ;  installation, so that we can update from it cleanly using the
++  ;  old updater.exe (which will still have this signature).
++  WriteRegStr HKLM "${_KEY}\1" "name" "${CERTIFICATE_NAME_PREVIOUS}"
++  WriteRegStr HKLM "${_KEY}\1" "issuer" "${CERTIFICATE_ISSUER_PREVIOUS}"
++  ClearErrors
++!macroend
++
+ !macro AddMaintCertKeys
+   Push $R0
+   ; Allow main Mozilla cert information for updates
+   ; This call will push the needed key on the stack
+   ServicesHelper::PathToUniqueRegistryPath "$INSTDIR"
+   Pop $R0
++  Push $R1
++  Push $R2
++  Push $R3
++  ; We always use the 64bit registry for certs.
++  ${If} ${RunningX64}
++  ${OrIf} ${IsNativeARM64}
++    SetRegView 64
++  ${EndIf}
++
+   ${If} $R0 != ""
+-    ; More than one certificate can be specified in a different subfolder
+-    ; for example: $R0\1, but each individual binary can be signed
+-    ; with at most one certificate.  A fallback certificate can only be used
+-    ; if the binary is replaced with a different certificate.
+-    ; We always use the 64bit registry for certs.
+-    ${If} ${RunningX64}
+-    ${OrIf} ${IsNativeARM64}
+-      SetRegView 64
+-    ${EndIf}
++    !insertmacro AddMaintCertKeyValues "$R0"
++  ${Else}
++    ; ServicesHelper could not be loaded.  This happens when PostUpdate is run
++    ; by the updater, which launches it with an environment too minimal for
++    ; NSIS to load its plugins, leaving the unique registry path uncomputable.
++    ; Fall back to refreshing every key that already records one of our own
++    ; certificate names, so that any installation of this application is kept
++    ; current rather than only the first one found.  Keys belonging to other
++    ; applications record a different name and are left alone.
++    StrCpy $R1 0
++    ${Do}
++      EnumRegKey $R2 HKLM "Software\Mozilla\MaintenanceService" $R1
++      ${If} $R2 == ""
++        ${ExitDo}
++      ${EndIf}
++      ReadRegStr $R3 HKLM "Software\Mozilla\MaintenanceService\$R2\0" "name"
++      ${If} $R3 == "${CERTIFICATE_NAME}"
++      ${OrIf} $R3 == "${CERTIFICATE_NAME_PREVIOUS}"
++        StrCpy $R0 "Software\Mozilla\MaintenanceService\$R2"
++        !insertmacro AddMaintCertKeyValues "$R0"
++      ${EndIf}
++      IntOp $R1 $R1 + 1
++    ${Loop}
++    StrCpy $R0 ""
++  ${EndIf}
+ 
+-    ; PrefetchProcessName was originally used to experiment with deleting
+-    ; Windows prefetch as a speed optimization.  It is no longer used though.
+-    DeleteRegValue HKLM "$R0" "prefetchProcessName"
+-
+-    ; Setting the Attempted value will ensure that a new Maintenance Service
+-    ; install will never be attempted again after this from updates.  The value
+-    ; is used only to see if updates should attempt new service installs.
+-    WriteRegDWORD HKLM "Software\Mozilla\MaintenanceService" "Attempted" 1
+-
+-    ; These values associate the allowed certificates for the current
+-    ; installation.
+-    WriteRegStr HKLM "$R0\0" "name" "${CERTIFICATE_NAME}"
+-    WriteRegStr HKLM "$R0\0" "issuer" "${CERTIFICATE_ISSUER}"
+-    ; These values associate the allowed certificates for the previous
+-    ;  installation, so that we can update from it cleanly using the
+-    ;  old updater.exe (which will still have this signature).
+-    WriteRegStr HKLM "$R0\1" "name" "${CERTIFICATE_NAME_PREVIOUS}"
+-    WriteRegStr HKLM "$R0\1" "issuer" "${CERTIFICATE_ISSUER_PREVIOUS}"
+-    ${If} ${RunningX64}
+-    ${OrIf} ${IsNativeARM64}
+-      SetRegView lastused
+-    ${EndIf}
+-    ClearErrors
++  ${If} ${RunningX64}
++  ${OrIf} ${IsNativeARM64}
++    SetRegView lastused
+   ${EndIf}
++
++  Pop $R3
++  Pop $R2
++  Pop $R1
+   ; Restore the previously used value back
+   Pop $R0
+ !macroend
++
+ !define AddMaintCertKeys "!insertmacro AddMaintCertKeys"
+ !endif
+ 

src/browser/installer/windows/nsis/uninstaller-nsi.patch

@@ -1,9 +1,18 @@
 diff --git a/browser/installer/windows/nsis/uninstaller.nsi b/browser/installer/windows/nsis/uninstaller.nsi
 old mode 100755
 new mode 100644
-index becbb0f70c84eb7f2d9bff5a3aedcbb7a78a61cf..05835d2088ab631316a25a9f0728898bd7998d8d
+index becbb0f70c84eb7f2d9bff5a3aedcbb7a78a61cf..a23a8a1b160932368377fc841b501df9355918db
 --- a/browser/installer/windows/nsis/uninstaller.nsi
 +++ b/browser/installer/windows/nsis/uninstaller.nsi
+@@ -150,7 +150,7 @@ OutFile "helper.exe"
+ !endif
+ ShowUnInstDetails nevershow
+ 
+-!define URLUninstallSurvey "https://qsurvey.mozilla.com/s3/FF-Desktop-Post-Uninstall?channel=${UpdateChannel}&version=${AppVersion}&osversion="
++!define URLUninstallSurvey "https://links.zen-browser.app/uninstall-feedback?osversion="
+ 
+ ; Support for the profile refresh feature
+ !define URLProfileRefreshHelp "https://support.mozilla.org/kb/refresh-firefox-reset-add-ons-and-settings"
 @@ -516,6 +516,7 @@ Section "Uninstall"
    ${un.RegCleanFileHandler}  ".svg"   "FirefoxHTML-$AppUserModelID"
    ${un.RegCleanFileHandler}  ".webp"  "FirefoxHTML-$AppUserModelID"

src/browser/modules/ExtensionsUI-sys-mjs.patch

@@ -1,10 +1,10 @@
 diff --git a/browser/modules/ExtensionsUI.sys.mjs b/browser/modules/ExtensionsUI.sys.mjs
-index 95a4b6e40bd568c3ea5003b648b0acbf96bbb725..6ab8a658721aa6470d482dc958e4b3ac78f49f44 100644
+index 73ef024602cb4554a024de4ddef83f492adc33ef..959c3403a48a3e4294ad5d2f72bad0e5d4fbfd75 100644
 --- a/browser/modules/ExtensionsUI.sys.mjs
 +++ b/browser/modules/ExtensionsUI.sys.mjs
-@@ -502,7 +502,7 @@ export var ExtensionsUI = {
-         eventCallback,
-         removeOnDismissal: true,
+@@ -507,7 +507,7 @@ export var ExtensionsUI = {
+         // right after the panel opens can't accidentally grant permissions).
+         autofocus: true,
          popupOptions: {
 -          position: "bottomright topright",
 +          position: window.gZenUIManager.panelUIPosition(),

src/browser/themes/linux/browser-css.patch

@@ -1,11 +1,11 @@
 diff --git a/browser/themes/linux/browser.css b/browser/themes/linux/browser.css
-index e735ec80b56e1a2da4bc5bec29136ce60353277b..330ea62d220d9acd96a95a605888839388e97452 100644
+index f276db1d456703493ee713370691352985021708..619ee6724eec1e6a25adcb257af0d02eb7a29d34 100644
 --- a/browser/themes/linux/browser.css
 +++ b/browser/themes/linux/browser.css
 @@ -14,7 +14,6 @@
      @media (-moz-gtk-theme-family) {
        --tabs-navbar-separator-style: none;
-       @media (prefers-color-scheme: light) and (not -moz-pref("browser.nova.enabled")) {
+       @media (prefers-color-scheme: light) {
 -        --urlbar-box-background-color: #fafafa;
        }
      }

src/browser/themes/shared/preferences/zen-preferences.css

@@ -40,7 +40,7 @@ html|dialog {
 }
 
 groupbox button {
-  border-radius: 5px !important;
+  border-radius: calc(5px * var(--zen-squircle-value)) !important;
 }
 
 groupbox button,

src/browser/themes/shared/tabbrowser/content-area-css.patch

@@ -1,16 +1,16 @@
 diff --git a/browser/themes/shared/tabbrowser/content-area.css b/browser/themes/shared/tabbrowser/content-area.css
-index 3acdec2b8e043fe27919cfa54e73f4d3c491bfc8..267a1087134464a8193a824a2d7f8ac15ff8ad60 100644
+index 86400b643c8b2af4207d226fbd6d91e5e74548b9..3044e4ab87b7ebcfaa2ac624680da1cc5653c861 100644
 --- a/browser/themes/shared/tabbrowser/content-area.css
 +++ b/browser/themes/shared/tabbrowser/content-area.css
-@@ -157,7 +157,6 @@
-   min-height: 0;
+@@ -166,7 +166,6 @@
+   min-width: 0;
  
    /* We want to be able to show the frame color behind the clipped radiused corner */
 -  background: var(--tabpanel-background-color);
  
-   @media -moz-pref("sidebar.revamp") {
-     outline: 0.01px solid var(--chrome-content-separator-color);
-@@ -216,7 +215,6 @@
+   display: grid;
+   /**
+@@ -355,7 +354,6 @@
    }
  
    browser:is([blank], [pendingpaint]) {
@@ -18,16 +18,16 @@ index 3acdec2b8e043fe27919cfa54e73f4d3c491bfc8..267a1087134464a8193a824a2d7f8ac1
    }
  
    /* Exclude browsers with smartwindow-content attribute which inherit
-@@ -553,7 +551,7 @@ split-view-footer {
+@@ -735,7 +733,7 @@ split-view-footer {
  
  .dialogStack {
    z-index: var(--browser-stack-z-index-dialog-stack);
 -  position: absolute;
 +  position: fixed;
-   inset: 0;
+ 
    /* --browser-with-dialog set on browser[tabDialogShowing], we want to position the overlay
       only on the top of the <browser> element so it doesn't overlap the DevTools toolbox */
-@@ -718,7 +716,7 @@ split-view-footer {
+@@ -909,7 +907,7 @@ split-view-footer {
  
  .dialogOverlay[topmost="true"],
  #window-modal-dialog::backdrop {

src/browser/themes/shared/tabbrowser/tabs-css.patch

@@ -1,17 +1,17 @@
 diff --git a/browser/themes/shared/tabbrowser/tabs.css b/browser/themes/shared/tabbrowser/tabs.css
-index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f253804576e 100644
+index 61c0b8382c78f63ad9113af55a6236c4a29bc45b..0ab463c768d4fb3f45d22e753f408c46b61c0480 100644
 --- a/browser/themes/shared/tabbrowser/tabs.css
 +++ b/browser/themes/shared/tabbrowser/tabs.css
-@@ -45,7 +45,7 @@
+@@ -46,7 +46,7 @@
    --tab-group-line-thickness: 2px;
    --tab-group-line-toolbar-border-distance: 1px;
    /* Collapsed tabs should be square, so set width to match the min height */
 -  --tab-collapsed-background-width: var(--tab-min-height);
 +  --tab-collapsed-background-width: 48px;
    --tab-collapsed-width: calc(var(--tab-collapsed-background-width) + 2 * var(--tab-inner-inline-margin));
+   --tab-collapsed-split-pill-offset: 0px;
    --tab-pinned-min-width-expanded: calc(var(--tab-pinned-expanded-background-width) + 2 * var(--tab-pinned-margin-inline-expanded));
-   --tab-note-icon-end-margin: var(--dimension-4);
-@@ -295,7 +295,6 @@ tab-split-view-wrapper[dragtarget] {
+@@ -308,7 +308,6 @@ tab-split-view-wrapper[dragtarget] {
    }
  
    :root:not([uidensity="compact"], [sidebar-expand-on-hover]) &[pinned] {
@@ -19,7 +19,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    }
  
    &:is([selected], [multiselected]) {
-@@ -309,6 +308,7 @@ tab-split-view-wrapper[dragtarget] {
+@@ -322,6 +321,7 @@ tab-split-view-wrapper[dragtarget] {
      border-radius: inherit;
      position: relative;
      overflow: hidden;
@@ -27,7 +27,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
  
      &::before {
        position: absolute;
-@@ -506,10 +506,6 @@ tab-split-view-wrapper[dragtarget] {
+@@ -519,10 +519,6 @@ tab-split-view-wrapper[dragtarget] {
  
    @media -moz-pref("browser.tabs.fadeOutUnloadedTabs") {
      &[pending] {
@@ -38,7 +38,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
        opacity: 0.5;
        /* Fade the favicon out */
        transition-property: filter, opacity;
-@@ -525,10 +521,6 @@ tab-split-view-wrapper[dragtarget] {
+@@ -538,10 +534,6 @@ tab-split-view-wrapper[dragtarget] {
  
    @media -moz-pref("browser.tabs.fadeOutExplicitlyUnloadedTabs") {
      &[pending][discarded] {
@@ -49,7 +49,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
        opacity: 0.5;
        /* Fade the favicon out */
        transition-property: filter, opacity;
-@@ -602,7 +594,7 @@ tab-split-view-wrapper[dragtarget] {
+@@ -615,7 +607,7 @@ tab-split-view-wrapper[dragtarget] {
    }
  
    #tabbrowser-tabs[orient="vertical"] & {
@@ -58,7 +58,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    }
  
    &[crashed] {
-@@ -610,7 +602,7 @@ tab-split-view-wrapper[dragtarget] {
+@@ -623,7 +615,7 @@ tab-split-view-wrapper[dragtarget] {
    }
  
    #tabbrowser-tabs[orient="vertical"]:not([expanded]) &:not([crashed]),
@@ -67,7 +67,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
      &[soundplaying] {
        list-style-image: url("chrome://browser/skin/tabbrowser/tab-audio-playing-small.svg");
      }
-@@ -664,7 +656,7 @@ tab-split-view-wrapper[dragtarget] {
+@@ -677,7 +669,7 @@ tab-split-view-wrapper[dragtarget] {
      }
    }
  
@@ -76,7 +76,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    &[crashed] {
      display: revert;
    }
-@@ -824,7 +816,7 @@ tab-split-view-wrapper[dragtarget] {
+@@ -837,7 +829,7 @@ tab-split-view-wrapper[dragtarget] {
        has not been added to root. There are certain scenarios when that attribute is temporarily
        removed from root such as when toggling the sidebar to expand with the toolbar button. */
      #tabbrowser-tabs[orient="horizontal"] &:not([pinned]):not([crashed]),
@@ -85,7 +85,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
        &:is([soundplaying], [muted], [activemedia-blocked]) {
          display: flex;
        }
-@@ -1044,7 +1036,6 @@ tab-split-view-wrapper[dragtarget] {
+@@ -1151,7 +1143,6 @@ tab-split-view-wrapper[dragtarget] {
  .tabbrowser-tab:is([image], [pinned]) > .tab-stack > .tab-content[attention]:not([selected]),
  .tabbrowser-tab > .tab-stack > .tab-content[pinned][titlechanged]:not([selected]),
  #tabbrowser-tabs[orient="vertical"] .tabbrowser-tab > .tab-stack > .tab-content[titlechanged]:not([selected]) {
@@ -93,7 +93,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    background-position: center bottom 6.5px;
    background-size: 4px 4px;
    background-repeat: no-repeat;
-@@ -1797,7 +1788,7 @@ tab-group {
+@@ -1904,7 +1895,7 @@ tab-group {
  }
  
  #tabbrowser-tabs[orient="vertical"][expanded] {
@@ -102,7 +102,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    &[movingtab][movingtab-addToGroup]:not([movingtab-group], [movingtab-ungroup]) .tabbrowser-tab:is(:active, [multiselected]) {
      margin-inline-start: var(--space-medium);
    }
-@@ -2351,7 +2342,7 @@ tab-group {
+@@ -2504,7 +2495,7 @@ tab-group {
    }
  }
  
@@ -111,8 +111,8 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
  #vertical-tabs-newtab-button {
    appearance: none;
    min-height: var(--tab-min-height);
-@@ -2362,7 +2353,7 @@ tab-group {
-   margin-inline: var(--tab-inner-inline-margin);
+@@ -2524,7 +2515,7 @@ tab-group {
+   }
  
    #tabbrowser-tabs[orient="vertical"]:not([expanded]) & > .toolbarbutton-text {
 -    display: none;
@@ -120,7 +120,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    }
  
    &:hover {
-@@ -2386,7 +2377,7 @@ tab-group {
+@@ -2548,7 +2539,7 @@ tab-group {
   * flex container. #tabs-newtab-button is a child of the arrowscrollbox where
   * we don't want a gap (between tabs), so we have to add some margin.
   */
@@ -129,7 +129,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    margin-block: var(--tab-margin-block);
  }
  
-@@ -2576,7 +2567,6 @@ tab-group {
+@@ -2740,7 +2731,6 @@ tab-group {
  
    &:not([expanded]) {
      .tabbrowser-tab[pinned] {
@@ -137,7 +137,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
      }
  
      .tab-background {
-@@ -2615,8 +2605,8 @@ tab-group {
+@@ -2779,8 +2769,8 @@ tab-group {
        display: block;
        position: absolute;
        inset: auto;
@@ -148,7 +148,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
  
        &:-moz-window-inactive {
          background-image:
-@@ -2714,9 +2704,6 @@ tab-group {
+@@ -2878,9 +2868,6 @@ tab-group {
    ~ #tabbrowser-tabs[orient="horizontal"]::before {
      display: flex;
      content: "";
@@ -158,7 +158,7 @@ index 0820fa040642ee05c2a24f5d2cfa58da5c926647..2d93abcce1729744e5963f1c6ad47f25
    }
  }
  
-@@ -2749,7 +2736,6 @@ toolbar:not(#TabsToolbar) #firefox-view-button {
+@@ -2913,7 +2900,6 @@ toolbar:not(#TabsToolbar) #firefox-view-button {
    list-style-image: url(chrome://global/skin/icons/plus.svg);
  }
  

src/browser/themes/shared/toolbarbuttons-css.patch

@@ -1,5 +1,5 @@
 diff --git a/browser/themes/shared/toolbarbuttons.css b/browser/themes/shared/toolbarbuttons.css
-index 94b1a2a841d8fd47a491616d52e5bf544f0c0bf9..9e98266b98c6b66fed26fec12fa3391fc5fcc79b 100644
+index bbf906c7bf1d6f0d71744953aeeb750c5181639a..dd116e22c38dc376c9c6b34dfa569bf4661a8971 100644
 --- a/browser/themes/shared/toolbarbuttons.css
 +++ b/browser/themes/shared/toolbarbuttons.css
 @@ -13,20 +13,6 @@
@@ -23,7 +23,7 @@ index 94b1a2a841d8fd47a491616d52e5bf544f0c0bf9..9e98266b98c6b66fed26fec12fa3391f
    &:where([uidensity="compact"]) {
      --toolbarbutton-padding-inner: var(--toolbarbutton-padding-inner-compact);
      --bookmark-block-padding: 1px;
-@@ -123,9 +109,7 @@
+@@ -119,9 +105,7 @@
  #TabsToolbar {
    /* Override the inner padding to ensure the dimensions match the tabs, but also making sure
       different types of buttons (combined-buttons-dropmarker or text) still look correct. */
@@ -33,18 +33,16 @@ index 94b1a2a841d8fd47a491616d52e5bf544f0c0bf9..9e98266b98c6b66fed26fec12fa3391f
  }
  
  /* Primary toolbar buttons */
-@@ -205,8 +189,8 @@ toolbar .toolbarbutton-1 {
+@@ -174,7 +158,7 @@
  
-   > .toolbarbutton-icon {
-     /* horizontal padding + actual icon width */
--    width: calc(2 * var(--toolbarbutton-padding-inner) + 16px);
--    height: calc(2 * var(--toolbarbutton-padding-inner) + 16px);
-+    width: calc(2 * var(--toolbarbutton-padding-inner) + var(--zen-toolbar-button-size, 16px));
-+    height: calc(2 * var(--toolbarbutton-padding-inner) + var(--zen-toolbar-button-size, 16px));
-   }
+ toolbar .toolbarbutton-1 {
+   /* horizontal padding + actual icon width */
+-  --toolbarbutton-icon-size: calc(2 * var(--toolbarbutton-padding-inner) + 16px);
++  --toolbarbutton-icon-size: calc(2 * var(--toolbarbutton-padding-inner) + var(--zen-toolbar-button-size, 16px));
  
-   > .toolbarbutton-text {
-@@ -216,7 +200,7 @@ toolbar .toolbarbutton-1 {
+   appearance: none;
+   margin: 0;
+@@ -214,7 +198,7 @@ toolbar .toolbarbutton-1 {
       * height as the button icons and the same vertical padding, but as a minimum,
       * because otherwise an increase in text sizes would break things.
       */
@@ -62,7 +60,7 @@ index 94b1a2a841d8fd47a491616d52e5bf544f0c0bf9..9e98266b98c6b66fed26fec12fa3391f
      display: none;
    }
  
-@@ -536,7 +520,7 @@ toolbarbutton.bookmark-item:not(.subviewbutton) {
+@@ -427,7 +411,7 @@ toolbarbutton.bookmark-item:not(.subviewbutton) {
       */
      align-items: stretch;
      > .toolbarbutton-icon {

src/browser/themes/shared/urlbar-css.patch

@@ -1,19 +1,19 @@
-diff --git a/browser/themes/shared/urlbar-searchbar.css b/browser/themes/shared/urlbar-searchbar.css
-index 22d624d718a289dd7b84ffc2f04dd35893dfbe95..4f57f7853f3043e3ad01d893aa928b9d2e6f3c16 100644
---- a/browser/themes/shared/urlbar-searchbar.css
-+++ b/browser/themes/shared/urlbar-searchbar.css
-@@ -19,8 +19,8 @@
+diff --git a/browser/themes/shared/urlbar.css b/browser/themes/shared/urlbar.css
+index 06183c82e2869290a5fb476c47fb7db92bbef57f..c64cde1eef50d3457fb1c540d95fe3b8aa087294 100644
+--- a/browser/themes/shared/urlbar.css
++++ b/browser/themes/shared/urlbar.css
+@@ -24,8 +24,8 @@
  
    @media not -moz-pref("browser.nova.enabled") {
-     --urlbar-basic-component-size: calc(var(--urlbar-min-height) - 2 * (var(--urlbar-input-container-border-width) + var(--urlbar-input-container-padding)));
--    --urlbar-icon-padding: calc((var(--urlbar-min-height) - 2px /* border */ - 2px /* padding */ - 16px /* icon */) / 2);
+     --urlbar-basic-component-size: calc(var(--urlbar-height) - 2 * (var(--urlbar-input-container-border-width) + var(--urlbar-input-container-padding)));
+-    --urlbar-icon-padding: calc((var(--urlbar-height) - 2px /* border */ - 2px /* padding */ - 16px /* icon */) / 2);
 -    --urlbar-input-container-padding: round(up, 1px, env(hairline));
-+    --urlbar-icon-padding: calc((var(--urlbar-min-height) - 2px /* border */ - 14px /* icon */) / 2);
++    --urlbar-icon-padding: calc((var(--urlbar-height) - 2px /* border */ - 14px /* icon */) / 2);
 +    --urlbar-input-container-padding: 2px;
    }
    @media (max-width: 770px) {
      --urlbar-container-min-width: 240px;
-@@ -126,7 +126,7 @@ toolbar[inactive="true"] .urlbar,
+@@ -143,7 +143,7 @@ toolbar[inactive="true"] .urlbar,
  .urlbar:not([usertyping]) > .urlbar-input-container > .urlbar-go-button,
  .urlbar:not(#searchbar-new, [focused]) > .urlbar-input-container > .urlbar-go-button,
  #urlbar-revert-button-container {
@@ -22,7 +22,7 @@ index 22d624d718a289dd7b84ffc2f04dd35893dfbe95..4f57f7853f3043e3ad01d893aa928b9d
  }
  
  /* Document Picture-in-Picture API window */
-@@ -403,6 +403,10 @@ toolbar[inactive="true"] .urlbar,
+@@ -434,6 +434,10 @@ toolbar[inactive="true"] .urlbar,
    .urlbar:not([focused])[textoverflow="left"][domaindir="rtl"] > .urlbar-input-container > .urlbar-input-box > & {
      mask-image: linear-gradient(to right, transparent var(--urlbar-scheme-size), black calc(var(--urlbar-scheme-size) + 3ch));
    }
@@ -33,16 +33,18 @@ index 22d624d718a289dd7b84ffc2f04dd35893dfbe95..4f57f7853f3043e3ad01d893aa928b9d
  }
  
  #urlbar-scheme {
-@@ -492,10 +496,14 @@ toolbar[inactive="true"] .urlbar,
+@@ -505,10 +509,15 @@ toolbar[inactive="true"] .urlbar,
+   }
  
    .urlbar[breakout][breakout-extend] {
-     height: auto;
+-    margin-left: calc(-1 * var(--urlbar-margin-inline));
 +    align-items: center;
-+    :root:not([zen-single-toolbar='true']) & {
-     margin-left: calc(-1 * var(--urlbar-margin-inline));
-+    }
      width: calc(var(--urlbar-width) + 2 * var(--urlbar-margin-inline));
  
++    :root:not([zen-single-toolbar="true"]) & {
++      margin-left: calc(-1 * var(--urlbar-margin-inline));
++    }
++
      > .urlbar-input-container {
 +      align-items: center;
        height: var(--urlbar-container-height);

src/browser/themes/shared/zen-icons/common/library/library.svg

@@ -0,0 +1,37 @@
+#filter dumbComments emptyLines substitution
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" fill="context-fill" fill-opacity="context-fill-opacity" class="zen-library-icon" viewBox="4 4 24 24"><style>@property --zen-triangle-anim { syntax: &apos;&lt;number&gt;&apos;; initial-value: 1; inherits: false; }
+    @property --zen-circle-anim { syntax: &apos;&lt;number&gt;&apos;; initial-value: 1; inherits: false; }
+    @keyframes StarBackward {
+      0% { transform: rotate(120deg); }
+      100% { transform: rotate(0deg); }
+    }
+    @keyframes TriangleBackward {
+      0% { --zen-triangle-anim: 1; }
+      100% { --zen-triangle-anim: 0; }
+    }
+    @keyframes CircleBackward {
+      0% { --zen-circle-anim: 1; }
+      100% { --zen-circle-anim: 0; }
+    }
+    @keyframes GlowBackward {
+      0% { opacity: 0.4; }
+      100% { opacity: 0; }
+    }
+    @keyframes GlowElementsBackward {
+      0% { opacity: 0.5; }
+      100% { opacity: 0; }
+    }
+    .zen-library-star { transform-origin: 10px 10.2px; animation: StarBackward 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
+    .zen-library-triangle-group { transform-origin: 17px 9.2px; animation: TriangleBackward 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards; transform: translate(calc(var(--zen-triangle-anim) * 2px), 0px) rotate(calc(var(--zen-triangle-anim) * 365deg)) scale(max(1 - var(--zen-triangle-anim) / 0.65, (var(--zen-triangle-anim) - 0.65) / 0.35)); }
+    .zen-library-circle { transform-origin: 0px 0px; animation: CircleBackward 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards; transform: translate(calc(var(--zen-circle-anim) * 1px), calc(var(--zen-circle-anim) * -1.5px)) scale(max(0, max((var(--zen-circle-anim) - 0.75) / 0.25, min(1, 1 - (var(--zen-circle-anim) - 0.3) / 0.35)))); }
+    .zen-library-glow { filter: blur(2px); animation: GlowBackward 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
+    .zen-library-glow-element { filter: blur(2px); animation: GlowElementsBackward 0.4s cubic-bezier(0.4, 0, 0.2, 1) forwards; }
+    .zen-library-glow-bg, .zen-library-glow-element { fill: transparent !important; stroke: none !important; }
+    .zen-library-glow-rays { stroke: transparent !important; fill: none !important; }
+    @media (prefers-color-scheme: dark) {
+      .zen-library-glow-bg, .zen-library-glow-element { fill: white !important; }
+      .zen-library-glow-rays { stroke: white !important; }
+    }</style><defs><mask id="zen-library-box-mask"><rect width="40" height="40" x="-10" y="-10" fill="#fff"/><rect width="40" height="40" x="-10" y="11.635" fill="#000"/></mask></defs><g fill-rule="evenodd"><g mask="url(#zen-library-box-mask)"><path d="M7.773 11.635c.363.228.467.44.445.659l-.182 1.788a.579.579 0 0 0 .946.503l1.38-1.153a.58.58 0 0 1 .604-.085l1.644.725a.578.578 0 0 0 .77-.745l-.679-1.692a.58.58 0 0 1 .115-.577l1.198-1.34a.578.578 0 0 0-.47-.962l-1.794.121a.58.58 0 0 1-.539-.286l-.904-1.553a.578.578 0 0 0-1.06.15l-.439 1.743a.58.58 0 0 1-.438.424l-1.757.38a.578.578 0 0 0-.186 1.055z" class="zen-library-star zen-library-glow-element"/><path d="M7.773 11.635c.363.228.467.44.445.659l-.182 1.788a.579.579 0 0 0 .946.503l1.38-1.153a.58.58 0 0 1 .604-.085l1.644.725a.578.578 0 0 0 .77-.745l-.679-1.692a.58.58 0 0 1 .115-.577l1.198-1.34a.578.578 0 0 0-.47-.962l-1.794.121a.58.58 0 0 1-.539-.286l-.904-1.553a.578.578 0 0 0-1.06.15l-.439 1.743a.58.58 0 0 1-.438.424l-1.757.38a.578.578 0 0 0-.186 1.055z" class="zen-library-star"/></g><g transform="translate(14, 6.2)"><circle r="1.4" class="zen-library-circle zen-library-glow-element"/><circle r="1" class="zen-library-circle"/></g><g class="zen-library-triangle-group"><g transform="translate(17, 9.2)"><path d="M-1.1 1.8c-.3.2-.6 0-.6-.3v-3c0-.3.3-.5.6-.3L1.4-.4c.3.2.3.6 0 .8Z" class="zen-library-triangle zen-library-glow-element"/><path d="M-1.1 1.8c-.3.2-.6 0-.6-.3v-3c0-.3.3-.5.6-.3L1.4-.4c.3.2.3.6 0 .8Z" class="zen-library-triangle"/></g></g><g class="zen-library-glow"><path d="m6.6 6.6 1.44 6.1h9.92l1.44-6.1Z" class="zen-library-glow-bg"/><path d="m6.1 6.6 1.94 6.1h9.92l1.94-6.1" class="zen-library-glow-rays"/></g><path d="M7.218 13.287c0-.456.37-.826.826-.826h9.913c.457 0 .826.37.826.826v4.131a3.304 3.304 0 0 1-3.304 3.304h-4.956a3.305 3.305 0 0 1-3.305-3.304zm3.391 1.239c0-.456.37-.826.826-.826h3.304a.826.826 0 1 1 0 1.652h-3.304a.826.826 0 0 1-.826-.826" class="zen-library-box"/></g></svg>

src/browser/themes/shared/zen-icons/icons.css

@@ -435,10 +435,6 @@
   list-style-image: url("arrow-left.svg") !important;
 }
 
-#appmenu-moreTools-button {
-  list-style-image: url("customize.svg") !important;
-}
-
 #zen-copy-current-url-button,
 #share-tab-button,
 #zen-site-data-header-share {
@@ -812,7 +808,8 @@
 
 #toolbar-context-toggle-vertical-tabs,
 #toolbar-context-customize-sidebar,
-#sidebarRevampSeparator {
+#sidebarRevampSeparator,
+.fxa-menu-sign-in-promo-image {
   display: none !important;
 }
 
@@ -879,7 +876,7 @@
   border-radius: var(--tab-border-radius);
 
   &:hover {
-    background: var(--toolbarbutton-hover-background);
+    background: var(--toolbarbutton-background-color-hover);
   }
 
   & image {

src/browser/themes/shared/zen-icons/jar.inc.mn

@@ -14,8 +14,8 @@
 *  skin/classic/browser/zen-icons/autoplay-media-fill.svg                      (../shared/zen-icons/nucleo/autoplay-media-fill.svg) 
 *  skin/classic/browser/zen-icons/autoplay-media.svg                      (../shared/zen-icons/nucleo/autoplay-media.svg) 
 *  skin/classic/browser/zen-icons/back.svg                      (../shared/zen-icons/nucleo/back.svg) 
-*  skin/classic/browser/zen-icons/blocked-element.svg                      (../shared/zen-icons/nucleo/blocked-element.svg) 
 *  skin/classic/browser/zen-icons/block.svg                      (../shared/zen-icons/nucleo/block.svg) 
+*  skin/classic/browser/zen-icons/blocked-element.svg                      (../shared/zen-icons/nucleo/blocked-element.svg) 
 *  skin/classic/browser/zen-icons/bolt.svg                      (../shared/zen-icons/nucleo/bolt.svg) 
 *  skin/classic/browser/zen-icons/bookmark-hollow.svg                      (../shared/zen-icons/nucleo/bookmark-hollow.svg) 
 *  skin/classic/browser/zen-icons/bookmark-star-on-tray.svg                      (../shared/zen-icons/nucleo/bookmark-star-on-tray.svg) 
@@ -104,26 +104,27 @@
 *  skin/classic/browser/zen-icons/popup-fill.svg                      (../shared/zen-icons/nucleo/popup-fill.svg) 
 *  skin/classic/browser/zen-icons/popup.svg                      (../shared/zen-icons/nucleo/popup.svg) 
 *  skin/classic/browser/zen-icons/print.svg                      (../shared/zen-icons/nucleo/print.svg) 
-*  skin/classic/browser/zen-icons/privateBrowsing.svg                      (../shared/zen-icons/nucleo/privateBrowsing.svg) 
+*  skin/classic/browser/zen-icons/private-window-small.svg                      (../shared/zen-icons/nucleo/private-window-small.svg) 
 *  skin/classic/browser/zen-icons/private-window.svg                      (../shared/zen-icons/nucleo/private-window.svg) 
+*  skin/classic/browser/zen-icons/privateBrowsing.svg                      (../shared/zen-icons/nucleo/privateBrowsing.svg) 
 *  skin/classic/browser/zen-icons/reader-mode.svg                      (../shared/zen-icons/nucleo/reader-mode.svg) 
 *  skin/classic/browser/zen-icons/reload.svg                      (../shared/zen-icons/nucleo/reload.svg) 
 *  skin/classic/browser/zen-icons/save.svg                      (../shared/zen-icons/nucleo/save.svg) 
 *  skin/classic/browser/zen-icons/screen-blocked.svg                      (../shared/zen-icons/nucleo/screen-blocked.svg) 
-*  skin/classic/browser/zen-icons/screenshot.svg                      (../shared/zen-icons/nucleo/screenshot.svg) 
 *  skin/classic/browser/zen-icons/screen.svg                      (../shared/zen-icons/nucleo/screen.svg) 
+*  skin/classic/browser/zen-icons/screenshot.svg                      (../shared/zen-icons/nucleo/screenshot.svg) 
 *  skin/classic/browser/zen-icons/search-glass.svg                      (../shared/zen-icons/nucleo/search-glass.svg) 
 *  skin/classic/browser/zen-icons/search-page.svg                      (../shared/zen-icons/nucleo/search-page.svg) 
 *  skin/classic/browser/zen-icons/security-broken.svg                      (../shared/zen-icons/nucleo/security-broken.svg) 
-*  skin/classic/browser/zen-icons/security.svg                      (../shared/zen-icons/nucleo/security.svg) 
 *  skin/classic/browser/zen-icons/security-warning.svg                      (../shared/zen-icons/nucleo/security-warning.svg) 
+*  skin/classic/browser/zen-icons/security.svg                      (../shared/zen-icons/nucleo/security.svg) 
 *  skin/classic/browser/zen-icons/send-to-device.svg                      (../shared/zen-icons/nucleo/send-to-device.svg) 
 *  skin/classic/browser/zen-icons/settings-fill.svg                      (../shared/zen-icons/nucleo/settings-fill.svg) 
 *  skin/classic/browser/zen-icons/settings.svg                      (../shared/zen-icons/nucleo/settings.svg) 
 *  skin/classic/browser/zen-icons/share.svg                      (../shared/zen-icons/nucleo/share.svg) 
 *  skin/classic/browser/zen-icons/sidebar-right.svg                      (../shared/zen-icons/nucleo/sidebar-right.svg) 
-*  skin/classic/browser/zen-icons/sidebars-right.svg                      (../shared/zen-icons/nucleo/sidebars-right.svg) 
 *  skin/classic/browser/zen-icons/sidebar.svg                      (../shared/zen-icons/nucleo/sidebar.svg) 
+*  skin/classic/browser/zen-icons/sidebars-right.svg                      (../shared/zen-icons/nucleo/sidebars-right.svg) 
 *  skin/classic/browser/zen-icons/sliders.svg                      (../shared/zen-icons/nucleo/sliders.svg) 
 *  skin/classic/browser/zen-icons/sparkles.svg                      (../shared/zen-icons/nucleo/sparkles.svg) 
 *  skin/classic/browser/zen-icons/spell-check.svg                      (../shared/zen-icons/nucleo/spell-check.svg) 
@@ -142,6 +143,7 @@
 *  skin/classic/browser/zen-icons/tracking-protection.svg                      (../shared/zen-icons/nucleo/tracking-protection.svg) 
 *  skin/classic/browser/zen-icons/translations.svg                      (../shared/zen-icons/nucleo/translations.svg) 
 *  skin/classic/browser/zen-icons/trash.svg                      (../shared/zen-icons/nucleo/trash.svg) 
+*  skin/classic/browser/zen-icons/u-turn-to-left.svg                      (../shared/zen-icons/nucleo/u-turn-to-left.svg) 
 *  skin/classic/browser/zen-icons/unpin.svg                      (../shared/zen-icons/nucleo/unpin.svg) 
 *  skin/classic/browser/zen-icons/video-blocked-fill.svg                      (../shared/zen-icons/nucleo/video-blocked-fill.svg) 
 *  skin/classic/browser/zen-icons/video-fill.svg                      (../shared/zen-icons/nucleo/video-fill.svg) 
@@ -164,8 +166,8 @@
 *  skin/classic/browser/zen-icons/autoplay-media-fill.svg                      (../shared/zen-icons/nucleo/autoplay-media-fill.svg) 
 *  skin/classic/browser/zen-icons/autoplay-media.svg                      (../shared/zen-icons/nucleo/autoplay-media.svg) 
 *  skin/classic/browser/zen-icons/back.svg                      (../shared/zen-icons/nucleo/back.svg) 
-*  skin/classic/browser/zen-icons/blocked-element.svg                      (../shared/zen-icons/nucleo/blocked-element.svg) 
 *  skin/classic/browser/zen-icons/block.svg                      (../shared/zen-icons/nucleo/block.svg) 
+*  skin/classic/browser/zen-icons/blocked-element.svg                      (../shared/zen-icons/nucleo/blocked-element.svg) 
 *  skin/classic/browser/zen-icons/bolt.svg                      (../shared/zen-icons/nucleo/bolt.svg) 
 *  skin/classic/browser/zen-icons/bookmark-hollow.svg                      (../shared/zen-icons/nucleo/bookmark-hollow.svg) 
 *  skin/classic/browser/zen-icons/bookmark-star-on-tray.svg                      (../shared/zen-icons/nucleo/bookmark-star-on-tray.svg) 
@@ -254,26 +256,27 @@
 *  skin/classic/browser/zen-icons/popup-fill.svg                      (../shared/zen-icons/nucleo/popup-fill.svg) 
 *  skin/classic/browser/zen-icons/popup.svg                      (../shared/zen-icons/nucleo/popup.svg) 
 *  skin/classic/browser/zen-icons/print.svg                      (../shared/zen-icons/nucleo/print.svg) 
-*  skin/classic/browser/zen-icons/privateBrowsing.svg                      (../shared/zen-icons/nucleo/privateBrowsing.svg) 
+*  skin/classic/browser/zen-icons/private-window-small.svg                      (../shared/zen-icons/nucleo/private-window-small.svg) 
 *  skin/classic/browser/zen-icons/private-window.svg                      (../shared/zen-icons/nucleo/private-window.svg) 
+*  skin/classic/browser/zen-icons/privateBrowsing.svg                      (../shared/zen-icons/nucleo/privateBrowsing.svg) 
 *  skin/classic/browser/zen-icons/reader-mode.svg                      (../shared/zen-icons/nucleo/reader-mode.svg) 
 *  skin/classic/browser/zen-icons/reload.svg                      (../shared/zen-icons/nucleo/reload.svg) 
 *  skin/classic/browser/zen-icons/save.svg                      (../shared/zen-icons/nucleo/save.svg) 
 *  skin/classic/browser/zen-icons/screen-blocked.svg                      (../shared/zen-icons/nucleo/screen-blocked.svg) 
-*  skin/classic/browser/zen-icons/screenshot.svg                      (../shared/zen-icons/nucleo/screenshot.svg) 
 *  skin/classic/browser/zen-icons/screen.svg                      (../shared/zen-icons/nucleo/screen.svg) 
+*  skin/classic/browser/zen-icons/screenshot.svg                      (../shared/zen-icons/nucleo/screenshot.svg) 
 *  skin/classic/browser/zen-icons/search-glass.svg                      (../shared/zen-icons/nucleo/search-glass.svg) 
 *  skin/classic/browser/zen-icons/search-page.svg                      (../shared/zen-icons/nucleo/search-page.svg) 
 *  skin/classic/browser/zen-icons/security-broken.svg                      (../shared/zen-icons/nucleo/security-broken.svg) 
-*  skin/classic/browser/zen-icons/security.svg                      (../shared/zen-icons/nucleo/security.svg) 
 *  skin/classic/browser/zen-icons/security-warning.svg                      (../shared/zen-icons/nucleo/security-warning.svg) 
+*  skin/classic/browser/zen-icons/security.svg                      (../shared/zen-icons/nucleo/security.svg) 
 *  skin/classic/browser/zen-icons/send-to-device.svg                      (../shared/zen-icons/nucleo/send-to-device.svg) 
 *  skin/classic/browser/zen-icons/settings-fill.svg                      (../shared/zen-icons/nucleo/settings-fill.svg) 
 *  skin/classic/browser/zen-icons/settings.svg                      (../shared/zen-icons/nucleo/settings.svg) 
 *  skin/classic/browser/zen-icons/share.svg                      (../shared/zen-icons/nucleo/share.svg) 
 *  skin/classic/browser/zen-icons/sidebar-right.svg                      (../shared/zen-icons/nucleo/sidebar-right.svg) 
-*  skin/classic/browser/zen-icons/sidebars-right.svg                      (../shared/zen-icons/nucleo/sidebars-right.svg) 
 *  skin/classic/browser/zen-icons/sidebar.svg                      (../shared/zen-icons/nucleo/sidebar.svg) 
+*  skin/classic/browser/zen-icons/sidebars-right.svg                      (../shared/zen-icons/nucleo/sidebars-right.svg) 
 *  skin/classic/browser/zen-icons/sliders.svg                      (../shared/zen-icons/nucleo/sliders.svg) 
 *  skin/classic/browser/zen-icons/sparkles.svg                      (../shared/zen-icons/nucleo/sparkles.svg) 
 *  skin/classic/browser/zen-icons/spell-check.svg                      (../shared/zen-icons/nucleo/spell-check.svg) 
@@ -292,6 +295,7 @@
 *  skin/classic/browser/zen-icons/tracking-protection.svg                      (../shared/zen-icons/nucleo/tracking-protection.svg) 
 *  skin/classic/browser/zen-icons/translations.svg                      (../shared/zen-icons/nucleo/translations.svg) 
 *  skin/classic/browser/zen-icons/trash.svg                      (../shared/zen-icons/nucleo/trash.svg) 
+*  skin/classic/browser/zen-icons/u-turn-to-left.svg                      (../shared/zen-icons/nucleo/u-turn-to-left.svg) 
 *  skin/classic/browser/zen-icons/unpin.svg                      (../shared/zen-icons/nucleo/unpin.svg) 
 *  skin/classic/browser/zen-icons/video-blocked-fill.svg                      (../shared/zen-icons/nucleo/video-blocked-fill.svg) 
 *  skin/classic/browser/zen-icons/video-fill.svg                      (../shared/zen-icons/nucleo/video-fill.svg) 
@@ -314,8 +318,8 @@
 *  skin/classic/browser/zen-icons/autoplay-media-fill.svg                      (../shared/zen-icons/nucleo/autoplay-media-fill.svg) 
 *  skin/classic/browser/zen-icons/autoplay-media.svg                      (../shared/zen-icons/nucleo/autoplay-media.svg) 
 *  skin/classic/browser/zen-icons/back.svg                      (../shared/zen-icons/nucleo/back.svg) 
-*  skin/classic/browser/zen-icons/blocked-element.svg                      (../shared/zen-icons/nucleo/blocked-element.svg) 
 *  skin/classic/browser/zen-icons/block.svg                      (../shared/zen-icons/nucleo/block.svg) 
+*  skin/classic/browser/zen-icons/blocked-element.svg                      (../shared/zen-icons/nucleo/blocked-element.svg) 
 *  skin/classic/browser/zen-icons/bolt.svg                      (../shared/zen-icons/nucleo/bolt.svg) 
 *  skin/classic/browser/zen-icons/bookmark-hollow.svg                      (../shared/zen-icons/nucleo/bookmark-hollow.svg) 
 *  skin/classic/browser/zen-icons/bookmark-star-on-tray.svg                      (../shared/zen-icons/nucleo/bookmark-star-on-tray.svg) 
@@ -404,26 +408,27 @@
 *  skin/classic/browser/zen-icons/popup-fill.svg                      (../shared/zen-icons/nucleo/popup-fill.svg) 
 *  skin/classic/browser/zen-icons/popup.svg                      (../shared/zen-icons/nucleo/popup.svg) 
 *  skin/classic/browser/zen-icons/print.svg                      (../shared/zen-icons/nucleo/print.svg) 
-*  skin/classic/browser/zen-icons/privateBrowsing.svg                      (../shared/zen-icons/nucleo/privateBrowsing.svg) 
+*  skin/classic/browser/zen-icons/private-window-small.svg                      (../shared/zen-icons/nucleo/private-window-small.svg) 
 *  skin/classic/browser/zen-icons/private-window.svg                      (../shared/zen-icons/nucleo/private-window.svg) 
+*  skin/classic/browser/zen-icons/privateBrowsing.svg                      (../shared/zen-icons/nucleo/privateBrowsing.svg) 
 *  skin/classic/browser/zen-icons/reader-mode.svg                      (../shared/zen-icons/nucleo/reader-mode.svg) 
 *  skin/classic/browser/zen-icons/reload.svg                      (../shared/zen-icons/nucleo/reload.svg) 
 *  skin/classic/browser/zen-icons/save.svg                      (../shared/zen-icons/nucleo/save.svg) 
 *  skin/classic/browser/zen-icons/screen-blocked.svg                      (../shared/zen-icons/nucleo/screen-blocked.svg) 
-*  skin/classic/browser/zen-icons/screenshot.svg                      (../shared/zen-icons/nucleo/screenshot.svg) 
 *  skin/classic/browser/zen-icons/screen.svg                      (../shared/zen-icons/nucleo/screen.svg) 
+*  skin/classic/browser/zen-icons/screenshot.svg                      (../shared/zen-icons/nucleo/screenshot.svg) 
 *  skin/classic/browser/zen-icons/search-glass.svg                      (../shared/zen-icons/nucleo/search-glass.svg) 
 *  skin/classic/browser/zen-icons/search-page.svg                      (../shared/zen-icons/nucleo/search-page.svg) 
 *  skin/classic/browser/zen-icons/security-broken.svg                      (../shared/zen-icons/nucleo/security-broken.svg) 
-*  skin/classic/browser/zen-icons/security.svg                      (../shared/zen-icons/nucleo/security.svg) 
 *  skin/classic/browser/zen-icons/security-warning.svg                      (../shared/zen-icons/nucleo/security-warning.svg) 
+*  skin/classic/browser/zen-icons/security.svg                      (../shared/zen-icons/nucleo/security.svg) 
 *  skin/classic/browser/zen-icons/send-to-device.svg                      (../shared/zen-icons/nucleo/send-to-device.svg) 
 *  skin/classic/browser/zen-icons/settings-fill.svg                      (../shared/zen-icons/nucleo/settings-fill.svg) 
 *  skin/classic/browser/zen-icons/settings.svg                      (../shared/zen-icons/nucleo/settings.svg) 
 *  skin/classic/browser/zen-icons/share.svg                      (../shared/zen-icons/nucleo/share.svg) 
 *  skin/classic/browser/zen-icons/sidebar-right.svg                      (../shared/zen-icons/nucleo/sidebar-right.svg) 
-*  skin/classic/browser/zen-icons/sidebars-right.svg                      (../shared/zen-icons/nucleo/sidebars-right.svg) 
 *  skin/classic/browser/zen-icons/sidebar.svg                      (../shared/zen-icons/nucleo/sidebar.svg) 
+*  skin/classic/browser/zen-icons/sidebars-right.svg                      (../shared/zen-icons/nucleo/sidebars-right.svg) 
 *  skin/classic/browser/zen-icons/sliders.svg                      (../shared/zen-icons/nucleo/sliders.svg) 
 *  skin/classic/browser/zen-icons/sparkles.svg                      (../shared/zen-icons/nucleo/sparkles.svg) 
 *  skin/classic/browser/zen-icons/spell-check.svg                      (../shared/zen-icons/nucleo/spell-check.svg) 
@@ -442,6 +447,7 @@
 *  skin/classic/browser/zen-icons/tracking-protection.svg                      (../shared/zen-icons/nucleo/tracking-protection.svg) 
 *  skin/classic/browser/zen-icons/translations.svg                      (../shared/zen-icons/nucleo/translations.svg) 
 *  skin/classic/browser/zen-icons/trash.svg                      (../shared/zen-icons/nucleo/trash.svg) 
+*  skin/classic/browser/zen-icons/u-turn-to-left.svg                      (../shared/zen-icons/nucleo/u-turn-to-left.svg) 
 *  skin/classic/browser/zen-icons/unpin.svg                      (../shared/zen-icons/nucleo/unpin.svg) 
 *  skin/classic/browser/zen-icons/video-blocked-fill.svg                      (../shared/zen-icons/nucleo/video-blocked-fill.svg) 
 *  skin/classic/browser/zen-icons/video-fill.svg                      (../shared/zen-icons/nucleo/video-fill.svg) 
@@ -459,8 +465,8 @@
 *  skin/classic/browser/zen-icons/selectable/basket.svg          (../shared/zen-icons/common/selectable/basket.svg) 
 *  skin/classic/browser/zen-icons/selectable/bed.svg          (../shared/zen-icons/common/selectable/bed.svg) 
 *  skin/classic/browser/zen-icons/selectable/bell.svg          (../shared/zen-icons/common/selectable/bell.svg) 
-*  skin/classic/browser/zen-icons/selectable/bookmark.svg          (../shared/zen-icons/common/selectable/bookmark.svg) 
 *  skin/classic/browser/zen-icons/selectable/book.svg          (../shared/zen-icons/common/selectable/book.svg) 
+*  skin/classic/browser/zen-icons/selectable/bookmark.svg          (../shared/zen-icons/common/selectable/bookmark.svg) 
 *  skin/classic/browser/zen-icons/selectable/briefcase.svg          (../shared/zen-icons/common/selectable/briefcase.svg) 
 *  skin/classic/browser/zen-icons/selectable/brush.svg          (../shared/zen-icons/common/selectable/brush.svg) 
 *  skin/classic/browser/zen-icons/selectable/bug.svg          (../shared/zen-icons/common/selectable/bug.svg) 
@@ -522,8 +528,8 @@
 *  skin/classic/browser/zen-icons/selectable/shapes.svg          (../shared/zen-icons/common/selectable/shapes.svg) 
 *  skin/classic/browser/zen-icons/selectable/shirt.svg          (../shared/zen-icons/common/selectable/shirt.svg) 
 *  skin/classic/browser/zen-icons/selectable/skull.svg          (../shared/zen-icons/common/selectable/skull.svg) 
-*  skin/classic/browser/zen-icons/selectable/squares.svg          (../shared/zen-icons/common/selectable/squares.svg) 
 *  skin/classic/browser/zen-icons/selectable/square.svg          (../shared/zen-icons/common/selectable/square.svg) 
+*  skin/classic/browser/zen-icons/selectable/squares.svg          (../shared/zen-icons/common/selectable/squares.svg) 
 *  skin/classic/browser/zen-icons/selectable/star-1.svg          (../shared/zen-icons/common/selectable/star-1.svg) 
 *  skin/classic/browser/zen-icons/selectable/star.svg          (../shared/zen-icons/common/selectable/star.svg) 
 *  skin/classic/browser/zen-icons/selectable/stats-chart.svg          (../shared/zen-icons/common/selectable/stats-chart.svg) 
@@ -540,4 +546,11 @@
 *  skin/classic/browser/zen-icons/selectable/warning.svg          (../shared/zen-icons/common/selectable/warning.svg) 
 *  skin/classic/browser/zen-icons/selectable/water.svg          (../shared/zen-icons/common/selectable/water.svg) 
 *  skin/classic/browser/zen-icons/selectable/weight.svg          (../shared/zen-icons/common/selectable/weight.svg) 
+*  skin/classic/browser/zen-icons/library/library-boosts-sprite.svg          (../shared/zen-icons/common/library/library-boosts-sprite.svg) 
+*  skin/classic/browser/zen-icons/library/library-downloads-sprite.svg          (../shared/zen-icons/common/library/library-downloads-sprite.svg) 
+*  skin/classic/browser/zen-icons/library/library-history-sprite.svg          (../shared/zen-icons/common/library/library-history-sprite.svg) 
+*  skin/classic/browser/zen-icons/library/library-media-sprite.svg          (../shared/zen-icons/common/library/library-media-sprite.svg) 
+*  skin/classic/browser/zen-icons/library/library-spaces-sprite.svg          (../shared/zen-icons/common/library/library-spaces-sprite.svg) 
+*  skin/classic/browser/zen-icons/library/library-sprite.svg          (../shared/zen-icons/common/library/library-sprite.svg) 
+*  skin/classic/browser/zen-icons/library/library.svg          (../shared/zen-icons/common/library/library.svg) 
   skin/classic/browser/zen-icons/icons.css                      (../shared/zen-icons/icons.css) 

src/browser/themes/shared/zen-icons/nucleo/private-window-small.svg

@@ -0,0 +1,5 @@
+#filter dumbComments emptyLines substitution
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="context-fill" fill-opacity="context-fill-opacity" viewBox="0 -1 20 20"><path d="M12.75 10.5a3.25 3.25 0 1 1-3.19 2.632 1.25 1.25 0 0 0-1.119 0q.059.3.059.618a3.25 3.25 0 1 1-3.25-3.25 3.24 3.24 0 0 1 2.571 1.268 2.74 2.74 0 0 1 2.357 0A3.24 3.24 0 0 1 12.75 10.5M5.25 12a1.75 1.75 0 1 0 0 3.5 1.75 1.75 0 0 0 0-3.5m7.5 0a1.75 1.75 0 1 0 0 3.5 1.75 1.75 0 0 0 0-3.5m-.867-11c.87 0 1.61.64 1.732 1.503l.34 2.393L16.78 7.72A.75.75 0 0 1 16.25 9H1.75a.751.751 0 0 1-.53-1.28l2.823-2.824.342-2.393A1.75 1.75 0 0 1 6.117 1zM3.56 7.5h10.88L12.94 6H5.06zm2.557-5a.25.25 0 0 0-.237.17l-.011.045L5.614 4.5h6.772l-.255-1.785a.25.25 0 0 0-.248-.215z"/></svg>

src/browser/themes/shared/zen-icons/nucleo/u-turn-to-left.svg

@@ -0,0 +1,5 @@
+#filter dumbComments emptyLines substitution
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If applicable, you may obtain one at
+# http://mozilla.org/MPL/2.0/.
+<svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" fill="context-fill" fill-opacity="context-fill-opacity" viewBox="0 0 18 18"><path d="M5.22 2.22a.75.75 0 1 1 1.06 1.06L4.06 5.5H12a4.5 4.5 0 0 1 0 9H8.25a.75.75 0 0 1 0-1.5H12a3 3 0 0 0 0-6H4.06l2.22 2.22a.75.75 0 0 1-1.06 1.06l-3.5-3.5a.75.75 0 0 1-.165-.812l.004-.01a1 1 0 0 1 .056-.105 1 1 0 0 1 .105-.133z"/></svg>

src/browser/themes/shared/zen-icons/update-resources.sh

@@ -60,6 +60,13 @@ do_common_icons() {
     echo "Working on $filename"
     echo "*  skin/classic/browser/zen-icons/selectable/$filename          (../shared/zen-icons/common/selectable/$filename) " >> jar.inc.mn
   done
+  for filename in common/library/*.svg; do
+    # remove the os/ prefix
+    add_header_to_file $filename
+    filename=$(basename $filename)
+    echo "Working on $filename"
+    echo "*  skin/classic/browser/zen-icons/library/$filename          (../shared/zen-icons/common/library/$filename) " >> jar.inc.mn
+  done
 }
 
 do_icons nucleo WIN    # TODO: use windows icons

src/build/moz-configure/lto-pgo-configure.patch

@@ -1,5 +1,5 @@
 diff --git a/build/moz.configure/lto-pgo.configure b/build/moz.configure/lto-pgo.configure
-index df2b0bf0081edfdc2c7bccaefc780d2b0c6555ff..53a3b55de7650799e3730372e72ad7b4bb2eea03 100644
+index c72af5ed5f88fc80c810ef626e57a8b991dee514..53a3b55de7650799e3730372e72ad7b4bb2eea03 100644
 --- a/build/moz.configure/lto-pgo.configure
 +++ b/build/moz.configure/lto-pgo.configure
 @@ -234,6 +234,7 @@ def moz_pgo_rust(pgo, profile_use, profile_generate, c_compiler):
@@ -14,7 +14,7 @@ index df2b0bf0081edfdc2c7bccaefc780d2b0c6555ff..53a3b55de7650799e3730372e72ad7b4
      help="Indicate that ld64 is free of symbol aliasing bugs",
  )
  
--imply_option("MOZ_LD64_KNOWN_GOOD", moz_automation)
+-imply_option("MOZ_LD64_KNOWN_GOOD", True, when=moz_automation)
  
  use_fat_lto = cxx_compiler.try_link(
      ldflags=depends(stlport_libs)(

src/external-patches/firefox/allow_backdrop_to_work_on_transparency.patch

@@ -1,167 +0,0 @@
-diff --git a/gfx/webrender_bindings/WebRenderAPI.cpp b/gfx/webrender_bindings/WebRenderAPI.cpp
---- a/gfx/webrender_bindings/WebRenderAPI.cpp
-+++ b/gfx/webrender_bindings/WebRenderAPI.cpp
-@@ -298,11 +298,13 @@
-                 panic_on_gl_error, picTileWidth, picTileHeight,
-                 gfx::gfxVars::WebRenderRequiresHardwareDriver(),
-                 StaticPrefs::gfx_webrender_low_quality_pinch_zoom_AtStartup(),
-                 StaticPrefs::gfx_webrender_max_shared_surface_size_AtStartup(),
-                 StaticPrefs::gfx_webrender_enable_subpixel_aa_AtStartup(),
--                compositor->ShouldUseLayerCompositor())) {
-+                compositor->ShouldUseLayerCompositor(),
-+                StaticPrefs::
-+                    gfx_webrender_opaque_backdrop_fallback_AtStartup())) {
-           // wr_window_new puts a message into gfxCriticalNote if it returns
-           // false
-           MOZ_ASSERT(errorMessage);
-           error.AssignASCII(errorMessage);
-           wr_api_free_error_msg(errorMessage);
-diff --git a/gfx/webrender_bindings/src/bindings.rs b/gfx/webrender_bindings/src/bindings.rs
---- a/gfx/webrender_bindings/src/bindings.rs
-+++ b/gfx/webrender_bindings/src/bindings.rs
-@@ -1998,10 +1998,11 @@
-     reject_software_rasterizer: bool,
-     low_quality_pinch_zoom: bool,
-     max_shared_surface_size: i32,
-     enable_subpixel_aa: bool,
-     use_layer_compositor: bool,
-+    opaque_backdrop_fallback: bool,
- ) -> bool {
-     assert!(unsafe { is_in_render_thread() });
- 
-     // Ensure the WR profiler callbacks are hooked up to the Gecko profiler.
-     set_profiler_hooks(Some(&PROFILER_HOOKS));
-@@ -2164,10 +2165,11 @@
-         texture_cache_config,
-         reject_software_rasterizer,
-         low_quality_pinch_zoom,
-         max_shared_surface_size,
-         enable_dithering,
-+        opaque_backdrop_fallback,
-         ..Default::default()
-     };
- 
-     let window_size = DeviceIntSize::new(window_width, window_height);
-     let notifier = Box::new(CppNotifier { window_id });
-diff --git a/gfx/wr/webrender/src/device/gl.rs b/gfx/wr/webrender/src/device/gl.rs
---- a/gfx/wr/webrender/src/device/gl.rs
-+++ b/gfx/wr/webrender/src/device/gl.rs
-@@ -3982,10 +3982,14 @@
- 
-     pub fn disable_color_write(&self) {
-         self.gl.color_mask(false, false, false, false);
-     }
- 
-+    pub fn set_color_mask(&self, r: bool, g: bool, b: bool, a: bool) {
-+        self.gl.color_mask(r, g, b, a);
-+    }
-+
-     pub fn set_blend(&mut self, enable: bool) {
-         if enable {
-             self.gl.enable(gl::BLEND);
-         } else {
-             self.gl.disable(gl::BLEND);
-diff --git a/gfx/wr/webrender/src/renderer/init.rs b/gfx/wr/webrender/src/renderer/init.rs
---- a/gfx/wr/webrender/src/renderer/init.rs
-+++ b/gfx/wr/webrender/src/renderer/init.rs
-@@ -204,6 +204,8 @@
-     pub low_quality_pinch_zoom: bool,
-     pub max_shared_surface_size: i32,
-     /// If true, open a debug socket to listen for remote debugger.
-     /// Relies on `debugger` cargo feature being enabled.
-     pub enable_debugger: bool,
-+    /// See explanation of `gfx.webrender.opaque-backdrop-fallback`.
-+    pub opaque_backdrop_fallback: bool,
- }
-@@ -277,9 +279,10 @@
-             enable_instancing: true,
-             reject_software_rasterizer: false,
-             low_quality_pinch_zoom: false,
-             max_shared_surface_size: 2048,
-             enable_debugger: true,
-+            opaque_backdrop_fallback: false,
-         }
-     }
- }
- 
-@@ -802,10 +805,11 @@
-         allocated_native_surfaces: FastHashSet::default(),
-         debug_overlay_state: DebugOverlayState::new(),
-         buffer_damage_tracker: BufferDamageTracker::default(),
-         max_primitive_instance_count,
-         enable_instancing: options.enable_instancing,
-+        opaque_backdrop_fallback: options.opaque_backdrop_fallback,
-         consecutive_oom_frames: 0,
-         target_frame_publish_id: None,
-         pending_result_msg: None,
-         layer_compositor_frame_state_in_prev_frame: None,
-         external_composite_debug_items: Vec::new(),
-diff --git a/gfx/wr/webrender/src/renderer/mod.rs b/gfx/wr/webrender/src/renderer/mod.rs
---- a/gfx/wr/webrender/src/renderer/mod.rs
-+++ b/gfx/wr/webrender/src/renderer/mod.rs
-@@ -867,10 +867,12 @@
-     buffer_damage_tracker: BufferDamageTracker,
- 
-     max_primitive_instance_count: usize,
-     enable_instancing: bool,
- 
-+    opaque_backdrop_fallback: bool,
-+
-     /// Count consecutive oom frames to detectif we are stuck unable to render
-     /// in a loop.
-     consecutive_oom_frames: u32,
- 
-     /// update() defers processing of ResultMsg, if frame_publish_id of
-@@ -2787,18 +2789,29 @@
-                 let read_target = ReadTarget::from_texture(cache_texture);
- 
-                 // Should always be drawing to picture cache tiles or off-screen surface!
-                 debug_assert!(!draw_target.is_default());
-                 let device_to_framebuffer = Scale::new(1i32);
-+                let dest_fb_rect = dest * device_to_framebuffer;
- 
-                 self.device.blit_render_target(
-                     read_target,
-                     src * device_to_framebuffer,
-                     draw_target,
--                    dest * device_to_framebuffer,
-+                    dest_fb_rect,
-                     TextureFilter::Linear,
-                 );
-+
-+                if self.opaque_backdrop_fallback {
-+                    self.device.set_color_mask(false, false, false, true);
-+                    self.device.clear_target(
-+                        Some([0.0, 0.0, 0.0, 1.0]),
-+                        None,
-+                        Some(dest_fb_rect),
-+                    );
-+                    self.device.set_color_mask(true, true, true, true);
-+                }
-             }
-         }
-     }
- 
-     fn draw_picture_cache_target(
-diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
---- a/modules/libpref/init/StaticPrefList.yaml
-+++ b/modules/libpref/init/StaticPrefList.yaml
-@@ -8439,10 +8439,17 @@
- #else
-   value: false
- #endif
-   mirror: once
- 
-+# Make backdrop-filter treat its captured backdrop as if it had been
-+# composited over an opaque-black background. (See bug 2036640)
-+- name: gfx.webrender.opaque-backdrop-fallback
-+  type: bool
-+  value: true
-+  mirror: once
-+
- # Disable wait of GPU execution completion
- - name: gfx.webrender.wait-gpu-finished.disabled
-   type: bool
-   value: false
-   mirror: once
-

src/external-patches/firefox/backdrop_filter_reads_web_content.patch

@@ -0,0 +1,886 @@
+diff --git a/gfx/wr/webrender/src/command_buffer.rs b/gfx/wr/webrender/src/command_buffer.rs
+index 9369cea..8c70d29 100644
+--- a/gfx/wr/webrender/src/command_buffer.rs
++++ b/gfx/wr/webrender/src/command_buffer.rs
+@@ -476,6 +476,9 @@ pub struct CommandBufferBuilder {
+ 
+     /// List of render tasks that depend on the task that will be created for this builder.
+     pub extra_dependencies: Vec<RenderTaskId>,
++
++    /// If true, backdrop-filters on this (tiled) surface also read back the slices below it.
++    pub backdrop_reads_lower_slices: bool,
+ }
+ 
+ impl CommandBufferBuilder {
+@@ -485,12 +488,14 @@ impl CommandBufferBuilder {
+             establishes_sub_graph: false,
+             resolve_source: None,
+             extra_dependencies: Vec::new(),
++            backdrop_reads_lower_slices: false,
+         }
+     }
+ 
+     /// Construct a tiled command buffer builder.
+     pub fn new_tiled(
+         tiles: FastHashMap<TileKey, SurfaceTileDescriptor>,
++        backdrop_reads_lower_slices: bool,
+     ) -> Self {
+         CommandBufferBuilder {
+             kind: CommandBufferBuilderKind::Tiled {
+@@ -499,6 +504,7 @@ impl CommandBufferBuilder {
+             establishes_sub_graph: false,
+             resolve_source: None,
+             extra_dependencies: Vec::new(),
++            backdrop_reads_lower_slices,
+         }
+     }
+ 
+@@ -518,6 +524,7 @@ impl CommandBufferBuilder {
+             establishes_sub_graph,
+             resolve_source: None,
+             extra_dependencies: Vec::new(),
++            backdrop_reads_lower_slices: false,
+         }
+     }
+ }
+diff --git a/gfx/wr/webrender/src/frame_builder.rs b/gfx/wr/webrender/src/frame_builder.rs
+index 068182d..1442528 100644
+--- a/gfx/wr/webrender/src/frame_builder.rs
++++ b/gfx/wr/webrender/src/frame_builder.rs
+@@ -17,7 +17,7 @@ use crate::gpu_types::{PrimitiveHeaders, ZBufferIdGenerator};
+ use crate::gpu_types::QuadSegment;
+ use crate::internal_types::{FastHashMap, PlaneSplitter, FrameStamp};
+ use crate::invalidation::DirtyRegion;
+-use crate::tile_cache::{SliceId, TileCacheInstance};
++use crate::tile_cache::{SliceId, TileCacheInstance, update_cross_slice_backdrops};
+ use crate::picture::PictureInstance;
+ use crate::picture::ResolvedSurfaceTexture;
+ use crate::picture::{RasterConfig, PictureScratch};
+@@ -487,6 +487,25 @@ impl FrameBuilder {
+                 }
+             }
+ 
++            if render_picture_cache_slices {
++                let slice_ids: Vec<SliceId> = scene.tile_cache_pictures
++                    .iter()
++                    .filter_map(|pic_index| {
++                        match scene.prim_store.pictures[pic_index.0 as usize].raster_config {
++                            Some(RasterConfig { composite_mode: PictureCompositeMode::TileCache { slice_id }, .. }) => Some(slice_id),
++                            _ => None,
++                        }
++                    })
++                    .collect();
++
++                update_cross_slice_backdrops(
++                    &slice_ids,
++                    tile_caches,
++                    &visibility_context,
++                    &composite_state.compositor_kind,
++                );
++            }
++
+             scratch.primitive.frame.assert_draws_resolved();
+ 
+             profile.end_time(profiler::FRAME_VISIBILITY_TIME);
+diff --git a/gfx/wr/webrender/src/picture.rs b/gfx/wr/webrender/src/picture.rs
+index 9b100ee..8f476e5 100644
+--- a/gfx/wr/webrender/src/picture.rs
++++ b/gfx/wr/webrender/src/picture.rs
+@@ -140,7 +140,8 @@ use std::ops::Range;
+ use crate::picture_textures::PictureCacheTextureHandle;
+ use crate::util::{MaxRect, Recycler, ScaleOffset};
+ use crate::tile_cache::{SliceDebugInfo, TileDebugInfo, DirtyTileDebugInfo, CompositorClipDebugInfo};
+-use crate::tile_cache::{SliceId, TileCacheInstance, TileSurface, NativeSurface};
++use crate::tile_cache::{SliceId, Tile, TileCacheInstance, TileSurface, NativeSurface};
++use crate::render_target::{LowerSliceSource, LowerSliceSourceKind};
+ use crate::tile_cache::{BackdropKind, BackdropSurface};
+ use crate::tile_cache::{TileKey, SubSliceIndex};
+ use crate::invalidation::InvalidationReason;
+@@ -1660,6 +1661,32 @@ fn prepare_tiled_picture_surface(
+     let device_pixel_scale = frame_state
+         .surfaces[surface_index.0]
+         .device_pixel_scale;
++
++    let pic_to_root = if tile_cache.feeds_cross_slice_backdrop {
++        frame_context.spatial_tree
++            .get_relative_transform(tile_cache.spatial_node_index, frame_context.root_spatial_node_index)
++            .as_2d_scale_offset()
++    } else {
++        None
++    };
++    let rounded_clip = tile_cache.compositor_clip.map(|clip_index| {
++        let clip = frame_state.composite_state.get_compositor_clip(clip_index);
++        (clip.rect.cast_unit(), clip.radius)
++    });
++    let local_clip_rect = tile_cache.local_clip_rect;
++    let lower_slice_source = move |tile: &Tile, kind: LowerSliceSourceKind, rect: PictureRect, sub_slice_index: usize| {
++        let pic_to_root = pic_to_root?;
++        let clip_rect = local_clip_rect
++            .intersection(&tile.cached_surface.current_descriptor.local_valid_rect)?;
++
++        Some(LowerSliceSource {
++            kind,
++            rect: pic_to_root.map_rect(&rect),
++            clip_rect: pic_to_root.map_rect(&clip_rect),
++            rounded_clip,
++            sub_slice_index,
++        })
++    };
+     let mut at_least_one_tile_visible = false;
+ 
+     // Get the overall device space rect of the picture cache. Used to clip
+@@ -1784,6 +1811,19 @@ fn prepare_tiled_picture_surface(
+ 
+             at_least_one_tile_visible = true;
+ 
++            if tile.feeds_cross_slice_backdrop {
++                if let Some(TileSurface::Color { color }) = tile.surface {
++                    if let Some(source) = lower_slice_source(
++                        tile,
++                        LowerSliceSourceKind::Color(color),
++                        tile.cached_surface.current_descriptor.local_valid_rect,
++                        sub_slice_index,
++                    ) {
++                        frame_state.surface_builder.lower_slice_sources.push(source);
++                    }
++                }
++            }
++
+             if let TileSurface::Texture { descriptor, .. } = tile.surface.as_mut().unwrap() {
+                 match descriptor {
+                     SurfaceTextureDescriptor::TextureCache { ref handle, .. } => {
+@@ -1972,7 +2012,8 @@ fn prepare_tiled_picture_surface(
+                     // TODO(gw): As a performance optimization, we could skip the resolve picture
+                     //           if the dirty rect is the same as the resolve rect (probably quite
+                     //           common for effects that scroll underneath a backdrop-filter, for example).
+-                    let use_tile_composite = !tile.cached_surface.sub_graphs.is_empty();
++                    let use_tile_composite = !tile.cached_surface.sub_graphs.is_empty() ||
++                        tile.feeds_cross_slice_backdrop;
+ 
+                     if use_tile_composite {
+                         let mut local_content_rect = tile.cached_surface.local_dirty_rect;
+@@ -2056,12 +2097,24 @@ fn prepare_tiled_picture_surface(
+                             ),
+                         );
+ 
++                        let lower_slice_source = if tile.feeds_cross_slice_backdrop {
++                            lower_slice_source(
++                                tile,
++                                LowerSliceSourceKind::Task(render_task_id),
++                                (content_device_rect.to_f32() / device_pixel_scale).cast_unit(),
++                                sub_slice_index,
++                            )
++                        } else {
++                            None
++                        };
++
+                         surface_render_tasks.insert(
+                             tile_key,
+                             SurfaceTileDescriptor {
+                                 current_task_id: render_task_id,
+                                 composite_task_id: Some(composite_task_id),
+                                 dirty_rect: tile.cached_surface.local_dirty_rect,
++                                lower_slice_source,
+                             },
+                         );
+                     } else {
+@@ -2097,6 +2150,7 @@ fn prepare_tiled_picture_surface(
+                                 current_task_id: render_task_id,
+                                 composite_task_id: None,
+                                 dirty_rect: tile.cached_surface.local_dirty_rect,
++                                lower_slice_source: None,
+                             },
+                         );
+                     }
+@@ -2262,7 +2316,10 @@ fn prepare_tiled_picture_surface(
+             );
+     }
+ 
+-    let descriptor = SurfaceDescriptor::new_tiled(surface_render_tasks);
++    let descriptor = SurfaceDescriptor::new_tiled(
++        surface_render_tasks,
++        tile_cache.backdrop_reads_lower_slices,
++    );
+ 
+     frame_state.surface_builder.push_surface(
+         surface_index,
+diff --git a/gfx/wr/webrender/src/render_target.rs b/gfx/wr/webrender/src/render_target.rs
+index 2185365..d3ca780 100644
+--- a/gfx/wr/webrender/src/render_target.rs
++++ b/gfx/wr/webrender/src/render_target.rs
+@@ -4,7 +4,7 @@
+ 
+ 
+ use api::units::*;
+-use api::{ColorF, LineOrientation, BorderStyle};
++use api::{BorderRadius, ColorF, LineOrientation, BorderStyle};
+ use crate::batch::{AlphaBatchBuilder, AlphaBatchContainer, BatchTextures, TextureSet};
+ use crate::batch::{BatchBuilder, INVALID_SEGMENT_INDEX, ClipMaskInstanceList};
+ use crate::render_task::{SubTask, RectangleClipSubTask, ImageClipSubTask};
+@@ -631,6 +631,33 @@ pub struct ResolveOp {
+     /// back the region the backdrop actually covers rather than one offset by
+     /// the difference between the two raster roots.
+     pub dest_to_src_raster: ScaleOffset,
++    /// Content of the picture cache slices below the backdrop root, drawn bottom-up
++    /// under the content of the src tasks.
++    pub lower_slice_sources: Vec<LowerSliceSource>,
++    /// Maps a rect from the dest surface's raster space into the root coordinate system.
++    pub dest_raster_to_root: ScaleOffset,
++}
++
++#[cfg_attr(feature = "capture", derive(Serialize))]
++#[cfg_attr(feature = "replay", derive(Deserialize))]
++#[derive(Debug, PartialEq, Clone)]
++pub enum LowerSliceSourceKind {
++    Task(RenderTaskId),
++    Color(ColorF),
++}
++
++/// Content of a picture cache tile that a backdrop-filter in a slice above it reads
++/// back.
++#[cfg_attr(feature = "capture", derive(Serialize))]
++#[cfg_attr(feature = "replay", derive(Deserialize))]
++#[derive(Debug, PartialEq, Clone)]
++pub struct LowerSliceSource {
++    pub kind: LowerSliceSourceKind,
++    /// The rect covered by the task's content, or by the color.
++    pub rect: LayoutRect,
++    pub clip_rect: LayoutRect,
++    pub rounded_clip: Option<(LayoutRect, BorderRadius)>,
++    pub sub_slice_index: usize,
+ }
+ 
+ #[cfg_attr(feature = "capture", derive(Serialize))]
+diff --git a/gfx/wr/webrender/src/renderer/composite.rs b/gfx/wr/webrender/src/renderer/composite.rs
+index 032a0e1..dd91394 100644
+--- a/gfx/wr/webrender/src/renderer/composite.rs
++++ b/gfx/wr/webrender/src/renderer/composite.rs
+@@ -6,6 +6,7 @@ use api::units::*;
+ use api::{ColorF, ImageBufferKind, ImageRendering, PremultipliedColorF};
+ use crate::batch::BatchTextures;
+ use crate::composite::{
++    CompositorClip,
+     CompositeState, CompositeSurfaceFormat, CompositeTileSurface, CompositorConfig,
+     CompositorInputLayer, CompositorSurfaceUsage, CompositorSurfaceTransform,
+     CompositeRoundedCorner, NativeTileId, ResolvedExternalSurface,
+@@ -20,7 +21,11 @@ use crate::debug_item::DebugItem;
+ use crate::segment::EdgeMask;
+ use crate::device::DrawTarget;
+ use crate::gpu_types::{CompositeInstance, ZBufferId};
+-use crate::internal_types::{FastHashMap, TextureSource};
++use crate::internal_types::{FastHashMap, Swizzle, TextureSource};
++use crate::render_target::{LowerSliceSourceKind, ResolveOp};
++use crate::render_task::RenderTaskKind;
++use crate::render_task_graph::RenderTaskGraph;
++use api::BorderRadius;
+ use crate::picture::ResolvedSurfaceTexture;
+ use super::RenderResults;
+ use crate::profiler::{self};
+@@ -435,6 +440,134 @@ impl Renderer {
+         }
+     }
+ 
++    pub(super) fn draw_resolve_with_lower_slices(
++        &mut self,
++        resolve_op: &ResolveOp,
++        render_tasks: &RenderTaskGraph,
++        draw_target: DrawTarget,
++        projection: &default::Transform3D<f32>,
++        src_copies: &[(TextureSource, DeviceIntRect, DeviceIntRect)],
++        stats: &mut RendererStats,
++    ) {
++        let dest_task = &render_tasks[resolve_op.dest_task_id];
++        let dest_info = match dest_task.kind {
++            RenderTaskKind::Picture(ref info) => info,
++            _ => panic!("bug: not a picture"),
++        };
++        let dest_task_rect = DeviceRect::from_origin_and_size(
++            dest_task.get_target_rect().min.to_f32(),
++            dest_info.content_size.to_f32(),
++        );
++        let dest_offset = dest_task_rect.min.to_vector() - dest_info.content_origin.to_vector();
++        let root_to_dest = |rect: &LayoutRect| -> DeviceRect {
++            let raster: WorldRect = resolve_op.dest_raster_to_root.unmap_rect(rect);
++            let device: DeviceRect = (raster * dest_info.device_pixel_scale).cast_unit();
++            device.translate(dest_offset)
++        };
++        let radius_scale = dest_info.device_pixel_scale.0 / resolve_op.dest_raster_to_root.scale.x;
++
++        let mut draws = Vec::new();
++
++        for source in &resolve_op.lower_slice_sources {
++            let clip_rect = match root_to_dest(&source.clip_rect).intersection(&dest_task_rect) {
++                Some(clip_rect) => clip_rect,
++                None => continue,
++            };
++            let rect = root_to_dest(&source.rect);
++            let clip = source.rounded_clip.map(|(clip_rect, radius)| {
++                CompositorClip {
++                    rect: root_to_dest(&clip_rect),
++                    radius: BorderRadius {
++                        top_left: radius.top_left * radius_scale,
++                        top_right: radius.top_right * radius_scale,
++                        bottom_left: radius.bottom_left * radius_scale,
++                        bottom_right: radius.bottom_right * radius_scale,
++                        ..radius
++                    },
++                }
++            });
++
++            match source.kind {
++                LowerSliceSourceKind::Task(task_id) => {
++                    let task = &render_tasks[task_id];
++                    let texture = TextureSource::TextureCache(task.get_target_texture(), Swizzle::default());
++                    let uv_rect = task.get_target_rect().to_f32();
++                    let instance = CompositeInstance::new_rgb(
++                        rect,
++                        clip_rect,
++                        PremultipliedColorF::WHITE,
++                        TexelRect::new(uv_rect.min.x, uv_rect.min.y, uv_rect.max.x, uv_rect.max.y),
++                        false,
++                        (false, false),
++                        clip.as_ref(),
++                    );
++                    let texture_size = self.texture_resolver.get_texture_size(&texture).to_f32();
++                    draws.push((instance, texture, Some(texture_size)));
++                }
++                LowerSliceSourceKind::Color(color) => {
++                    let instance = CompositeInstance::new(
++                        rect,
++                        clip_rect,
++                        color.premultiplied(),
++                        (false, false),
++                        clip.as_ref(),
++                    );
++                    draws.push((instance, TextureSource::Dummy, None));
++                }
++            }
++        }
++
++        for (texture, src, dest) in src_copies {
++            let dest = dest.to_f32();
++            let src = src.to_f32();
++            let instance = CompositeInstance::new_rgb(
++                dest,
++                dest,
++                PremultipliedColorF::WHITE,
++                TexelRect::new(src.min.x, src.min.y, src.max.x, src.max.y),
++                false,
++                (false, false),
++                None,
++            );
++            let texture_size = self.texture_resolver.get_texture_size(texture).to_f32();
++            draws.push((instance, *texture, Some(texture_size)));
++        }
++
++        self.device.bind_draw_target(draw_target);
++        self.device.disable_depth();
++        self.device.disable_depth_write();
++        self.set_blend(true, FramebufferKind::Other);
++        self.set_blend_mode_premultiplied_alpha(FramebufferKind::Other);
++
++        for (instance, texture, texture_size) in draws {
++            let features = instance.get_rgb_features();
++
++            self.shaders
++                .borrow_mut()
++                .get_composite_shader(
++                    CompositeSurfaceFormat::Rgba,
++                    texture.image_buffer_kind(),
++                    features,
++                ).bind(
++                    &mut self.device,
++                    projection,
++                    texture_size,
++                    &mut self.renderer_errors,
++                    &mut self.profile,
++                    &mut self.command_log,
++                );
++
++            self.draw_instanced_batch(
++                &[instance],
++                VertexArrayKind::Composite,
++                &BatchTextures::composite_rgb(texture),
++                stats,
++            );
++        }
++
++        self.set_blend(false, FramebufferKind::Other);
++    }
++
+     // Composite tiles in a swapchain. When using LayerCompositor, we may
+     // split the compositing in to multiple swapchains.
+     fn composite_pass(
+diff --git a/gfx/wr/webrender/src/renderer/mod.rs b/gfx/wr/webrender/src/renderer/mod.rs
+index d177263..a45ec70 100644
+--- a/gfx/wr/webrender/src/renderer/mod.rs
++++ b/gfx/wr/webrender/src/renderer/mod.rs
+@@ -2288,6 +2288,8 @@ impl Renderer {
+         resolve_ops: &[ResolveOp],
+         render_tasks: &RenderTaskGraph,
+         draw_target: DrawTarget,
++        projection: &default::Transform3D<f32>,
++        stats: &mut RendererStats,
+     ) {
+         if resolve_ops.is_empty() {
+             return;
+@@ -2300,6 +2302,8 @@ impl Renderer {
+                 resolve_op,
+                 render_tasks,
+                 draw_target,
++                projection,
++                stats,
+             );
+         }
+ 
+@@ -2729,7 +2733,12 @@ impl Renderer {
+         resolve_op: &ResolveOp,
+         render_tasks: &RenderTaskGraph,
+         draw_target: DrawTarget,
++        projection: &default::Transform3D<f32>,
++        stats: &mut RendererStats,
+     ) {
++        let has_lower_slices = !resolve_op.lower_slice_sources.is_empty();
++        let mut src_copies = Vec::new();
++
+         for src_task_id in &resolve_op.src_task_ids {
+             let src_task = &render_tasks[*src_task_id];
+             let src_info = match src_task.kind {
+@@ -2818,6 +2827,12 @@ impl Renderer {
+                     src_task.get_target_texture(),
+                     Swizzle::default(),
+                 );
++
++                if has_lower_slices {
++                    src_copies.push((texture_source, src, dest));
++                    continue;
++                }
++
+                 let (cache_texture, _) = self.texture_resolver
+                     .resolve(&texture_source).expect("bug: no source texture");
+ 
+@@ -2836,6 +2851,17 @@ impl Renderer {
+                 );
+             }
+         }
++
++        if has_lower_slices {
++            self.draw_resolve_with_lower_slices(
++                resolve_op,
++                render_tasks,
++                draw_target,
++                projection,
++                &src_copies,
++                stats,
++            );
++        }
+     }
+ 
+     fn draw_picture_cache_target(
+@@ -3385,6 +3411,8 @@ impl Renderer {
+             &target.resolve_ops,
+             render_tasks,
+             draw_target,
++            &projection,
++            stats,
+         );
+ 
+         // Handle any blits from the texture cache to this target.
+diff --git a/gfx/wr/webrender/src/surface.rs b/gfx/wr/webrender/src/surface.rs
+index 20536bb..f8a8709 100644
+--- a/gfx/wr/webrender/src/surface.rs
++++ b/gfx/wr/webrender/src/surface.rs
+@@ -14,7 +14,7 @@ use crate::picture_composite_mode::PictureCompositeMode;
+ use crate::tile_cache::{TileKey, SubSliceIndex, MAX_COMPOSITOR_SURFACES};
+ use crate::prim_store::PictureIndex;
+ use crate::render_task_graph::{RenderTaskId, RenderTaskGraphBuilder};
+-use crate::render_target::ResolveOp;
++use crate::render_target::{LowerSliceSource, LowerSliceSourceKind, ResolveOp};
+ use crate::render_task::{RenderTask, RenderTaskKind, RenderTaskLocation};
+ use crate::space::SpaceMapper;
+ use crate::spatial_tree::{CoordinateSpaceMapping, SpatialTree, SpatialNodeIndex};
+@@ -380,6 +380,8 @@ pub struct SurfaceTileDescriptor {
+     pub composite_task_id: Option<RenderTaskId>,
+     /// Dirty rect for this tile
+     pub dirty_rect: PictureRect,
++    /// Set if this tile's content is read back by a backdrop-filter in a slice above.
++    pub lower_slice_source: Option<LowerSliceSource>,
+ }
+ 
+ // Details of how a surface is rendered
+@@ -387,6 +389,7 @@ pub enum SurfaceDescriptorKind {
+     // Picture cache tiles
+     Tiled {
+         tiles: FastHashMap<TileKey, SurfaceTileDescriptor>,
++        backdrop_reads_lower_slices: bool,
+     },
+     // A single surface (e.g. for an opacity filter)
+     Simple {
+@@ -410,10 +413,12 @@ impl SurfaceDescriptor {
+     // Create a picture cache tiled surface
+     pub fn new_tiled(
+         tiles: FastHashMap<TileKey, SurfaceTileDescriptor>,
++        backdrop_reads_lower_slices: bool,
+     ) -> Self {
+         SurfaceDescriptor {
+             kind: SurfaceDescriptorKind::Tiled {
+                 tiles,
++                backdrop_reads_lower_slices,
+             },
+         }
+     }
+@@ -526,6 +531,9 @@ pub struct SurfaceBuilder {
+     // A map of the output render tasks from any sub-graphs that haven't
+     // been consumed by BackdropRender prims yet
+     pub sub_graph_output_map: FastHashMap<PictureIndex, RenderTaskId>,
++    // Content of the picture cache slices built so far that backdrop-filters in
++    // slices above them read back, ordered bottom-up
++    pub lower_slice_sources: Vec<LowerSliceSource>,
+ }
+ 
+ impl SurfaceBuilder {
+@@ -534,6 +542,7 @@ impl SurfaceBuilder {
+             current_cmd_buffers: CommandBufferTargets::new(),
+             builder_stack: Vec::new(),
+             sub_graph_output_map: FastHashMap::default(),
++            lower_slice_sources: Vec::new(),
+         }
+     }
+ 
+@@ -574,9 +583,10 @@ impl SurfaceBuilder {
+ 
+         let builder = if let Some(descriptor) = descriptor {
+             match descriptor.kind {
+-                SurfaceDescriptorKind::Tiled { tiles } => {
++                SurfaceDescriptorKind::Tiled { tiles, backdrop_reads_lower_slices } => {
+                     CommandBufferBuilder::new_tiled(
+                         tiles,
++                        backdrop_reads_lower_slices,
+                     )
+                 }
+                 SurfaceDescriptorKind::Simple { render_task_id, dirty_rect, .. } => {
+@@ -700,6 +710,7 @@ impl SurfaceBuilder {
+                     // Get info about the resolve operation to copy from parent surface or tiles to the picture cache task
+                     if let Some(resolve_task_id) = builder.resolve_source {
+                         let mut src_task_ids = Vec::new();
++                        let reads_lower_slices = self.builder_stack.last().unwrap().backdrop_reads_lower_slices;
+ 
+                         // Make the output of the sub-graph a dependency of the new replacement tile task
+                         let _old = self.sub_graph_output_map.insert(
+@@ -869,6 +880,27 @@ impl SurfaceBuilder {
+                             &src_task_ids,
+                         );
+ 
++                        let mut lower_slice_sources = Vec::new();
++                        let mut dest_raster_to_root = ScaleOffset::identity();
++
++                        if reads_lower_slices && !self.lower_slice_sources.is_empty() {
++                            let dest_raster = raster_spatial_node(rg_builder, resolve_task_id);
++                            let to_root = spatial_tree
++                                .get_relative_transform(dest_raster, spatial_tree.root_reference_frame_index())
++                                .as_2d_scale_offset();
++
++                            if let Some(to_root) = to_root {
++                                dest_raster_to_root = to_root;
++                                lower_slice_sources = self.lower_slice_sources.clone();
++
++                                for source in &lower_slice_sources {
++                                    if let LowerSliceSourceKind::Task(task_id) = source.kind {
++                                        rg_builder.add_dependency(resolve_task_id, task_id);
++                                    }
++                                }
++                            }
++                        }
++
+                         let dest_task = rg_builder.get_task_mut(resolve_task_id);
+ 
+                         match dest_task.kind {
+@@ -878,6 +910,8 @@ impl SurfaceBuilder {
+                                     src_task_ids,
+                                     dest_task_id: resolve_task_id,
+                                     dest_to_src_raster,
++                                    lower_slice_sources,
++                                    dest_raster_to_root,
+                                 })
+                             }
+                             _ => {
+@@ -917,7 +951,16 @@ impl SurfaceBuilder {
+         } else {
+             match builder.kind {
+                 CommandBufferBuilderKind::Tiled { ref tiles } => {
++                    let first_source = self.lower_slice_sources.len();
++
+                     for (_, descriptor) in tiles {
++                        if let Some(ref source) = descriptor.lower_slice_source {
++                            self.lower_slice_sources.push(LowerSliceSource {
++                                kind: LowerSliceSourceKind::Task(descriptor.current_task_id),
++                                ..source.clone()
++                            });
++                        }
++
+                         if let Some(composite_task_id) = descriptor.composite_task_id {
+                             rg_builder.add_dependency(
+                                 composite_task_id,
+@@ -933,6 +976,8 @@ impl SurfaceBuilder {
+                             }
+                         }
+                     }
++
++                    self.lower_slice_sources[first_source ..].sort_by_key(|source| source.sub_slice_index);
+                 }
+                 CommandBufferBuilderKind::Simple { render_task_id: child_task_id, root_task_id: child_root_task_id, .. } => {
+                     match self.builder_stack.last().unwrap().kind {
+diff --git a/gfx/wr/webrender/src/tile_cache/mod.rs b/gfx/wr/webrender/src/tile_cache/mod.rs
+index 731be26..d20e6ac 100644
+--- a/gfx/wr/webrender/src/tile_cache/mod.rs
++++ b/gfx/wr/webrender/src/tile_cache/mod.rs
+@@ -198,6 +198,8 @@ pub struct TileCacheParams {
+     // This is only a suggestion - the tile cache will clamp this as a reasonable number
+     // and only promote a limited number of surfaces.
+     pub yuv_image_surface_count: usize,
++    // If true, backdrop-filters in this slice also read back content from the slices below it.
++    pub backdrop_reads_lower_slices: bool,
+ }
+ 
+ /// The backing surface for this tile.
+@@ -250,6 +252,8 @@ pub struct Tile {
+     pub cached_surface: CachedSurface,
+     /// Raster-space rect for this tile, cached to avoid recomputing per primitive.
+     pub local_raster_rect: RasterRect,
++    /// If true, this tile is read back this frame by a slice above.
++    pub feeds_cross_slice_backdrop: bool,
+ }
+ 
+ impl Tile {
+@@ -269,6 +273,7 @@ impl Tile {
+             z_id: ZBufferId::invalid(),
+             cached_surface: CachedSurface::new(),
+             local_raster_rect: RasterRect::zero(),
++            feeds_cross_slice_backdrop: false,
+         }
+     }
+ 
+@@ -828,6 +833,15 @@ pub struct TileCacheInstance {
+     pub yuv_images_remaining: usize,
+     /// Persistent cache for computing and storing raster-space primitive corners.
+     corners_cache: CornersCache,
++    /// If true, backdrop-filters in this slice also read back content from the slices below it.
++    pub backdrop_reads_lower_slices: bool,
++    /// The picture-space coverage rects of the backdrop-filters found in this slice this frame.
++    backdrop_render_rects: Vec<PictureRect>,
++    /// The picture to root transform of this slice in the previous frame, used to detect
++    /// movement relative to backdrop-filters in slices above.
++    prev_pic_to_root: Option<ScaleOffset>,
++    /// If true, some tiles of this slice are read back by a backdrop-filter in a slice above.
++    pub feeds_cross_slice_backdrop: bool,
+ }
+ 
+ impl TileCacheInstance {
+@@ -893,6 +907,10 @@ impl TileCacheInstance {
+             yuv_images_count: params.yuv_image_surface_count,
+             yuv_images_remaining: 0,
+             corners_cache: CornersCache::new(),
++            backdrop_reads_lower_slices: params.backdrop_reads_lower_slices,
++            backdrop_render_rects: Vec::new(),
++            prev_pic_to_root: None,
++            feeds_cross_slice_backdrop: false,
+         }
+     }
+ 
+@@ -970,6 +988,7 @@ impl TileCacheInstance {
+         self.background_color = params.background_color;
+         self.shared_clip_leaf_id = params.shared_clip_leaf_id;
+         self.shared_clip_node_id = params.shared_clip_node_id;
++        self.backdrop_reads_lower_slices = params.backdrop_reads_lower_slices;
+ 
+         // Since the slice flags may have changed, ensure we re-evaluate the
+         // appropriate tile size for this cache next update.
+@@ -1040,6 +1059,7 @@ impl TileCacheInstance {
+         self.local_rect = pic_rect;
+         self.local_clip_rect = PictureRect::max_rect();
+         self.deferred_dirty_tests.clear();
++        self.backdrop_render_rects.clear();
+         self.mix_blend_pic_rects.clear();
+         self.underlays.clear();
+         self.overlay_region = PictureRect::zero();
+@@ -2667,6 +2687,8 @@ impl TileCacheInstance {
+                         }
+                     }
+ 
++                    self.backdrop_render_rects.push(pic_coverage_rect);
++
+                     // For backdrop-filter, we need to check if any of the dirty rects
+                     // in tiles that are affected by the filter primitive are dirty.
+                     self.deferred_dirty_tests.push(DeferredDirtyTest {
+@@ -3264,6 +3286,159 @@ impl TileCacheInstance {
+ }
+ 
+ 
++fn slice_is_dirty_in_rect(tile_cache: &TileCacheInstance, rect: &PictureRect) -> bool {
++    tile_cache.sub_slices.iter().any(|sub_slice| {
++        sub_slice.tiles.values().any(|tile| {
++            tile.is_visible &&
++            !tile.cached_surface.is_valid &&
++            tile.cached_surface.local_dirty_rect.intersects(rect)
++        })
++    })
++}
++
++fn invalidate_slice_rect(
++    tile_cache: &mut TileCacheInstance,
++    rect: &PictureRect,
++    supports_dirty_rects: bool,
++    feeds_cross_slice_backdrop: bool,
++) {
++    let mut rects = vec![*rect];
++
++    rects.extend(
++        tile_cache.backdrop_render_rects
++            .iter()
++            .filter(|backdrop_rect| backdrop_rect.intersects(rect))
++            .cloned()
++    );
++
++    for sub_slice in &mut tile_cache.sub_slices {
++        for tile in sub_slice.tiles.values_mut() {
++            if !tile.is_visible {
++                continue;
++            }
++
++            for rect in &rects {
++                if !tile.cached_surface.local_rect.intersects(rect) {
++                    continue;
++                }
++
++                tile.invalidate(Some(*rect), InvalidationReason::SurfaceContentChanged);
++                if !supports_dirty_rects {
++                    tile.cached_surface.local_dirty_rect = tile.cached_surface.local_rect;
++                }
++                tile.feeds_cross_slice_backdrop |= feeds_cross_slice_backdrop;
++                tile_cache.feeds_cross_slice_backdrop |= feeds_cross_slice_backdrop;
++            }
++        }
++    }
++}
++
++pub fn update_cross_slice_backdrops(
++    slice_ids: &[SliceId],
++    tile_caches: &mut FastHashMap<SliceId, Box<TileCacheInstance>>,
++    frame_context: &FrameVisibilityContext,
++    compositor_kind: &CompositorKind,
++) {
++    let supports_dirty_rects = match compositor_kind {
++        CompositorKind::Draw { .. } | CompositorKind::Layer { .. } => {
++            frame_context.config.gpu_supports_render_target_partial_update
++        }
++        CompositorKind::Native { capabilities, .. } => {
++            capabilities.max_update_rects > 0
++        }
++    };
++
++    let any_backdrop = slice_ids.iter().any(|slice_id| {
++        let tile_cache = &tile_caches[slice_id];
++        tile_cache.backdrop_reads_lower_slices && !tile_cache.backdrop_render_rects.is_empty()
++    });
++
++    let mut pic_to_root = Vec::with_capacity(slice_ids.len());
++    let mut moved = Vec::with_capacity(slice_ids.len());
++
++    for slice_id in slice_ids {
++        let tile_cache = tile_caches.get_mut(slice_id).expect("bug: non-existent tile cache");
++
++        if tile_cache.feeds_cross_slice_backdrop {
++            tile_cache.feeds_cross_slice_backdrop = false;
++            for sub_slice in &mut tile_cache.sub_slices {
++                for tile in sub_slice.tiles.values_mut() {
++                    tile.feeds_cross_slice_backdrop = false;
++                }
++            }
++        }
++
++        if !any_backdrop {
++            tile_cache.prev_pic_to_root = None;
++            continue;
++        }
++
++        let transform = frame_context.spatial_tree
++            .get_relative_transform(tile_cache.spatial_node_index, frame_context.root_spatial_node_index)
++            .as_2d_scale_offset();
++
++        moved.push(transform != tile_cache.prev_pic_to_root);
++        tile_cache.prev_pic_to_root = transform;
++        pic_to_root.push(transform);
++    }
++
++    if !any_backdrop {
++        return;
++    }
++
++    for top in 1 .. slice_ids.len() {
++        let top_transform = match pic_to_root[top] {
++            Some(transform) => transform,
++            None => continue,
++        };
++
++        let backdrop_rects = {
++            let tile_cache = &tile_caches[&slice_ids[top]];
++            if !tile_cache.backdrop_reads_lower_slices {
++                continue;
++            }
++            tile_cache.backdrop_render_rects.clone()
++        };
++
++        for backdrop_rect in backdrop_rects {
++            let root_rect: LayoutRect = top_transform.map_rect(&backdrop_rect);
++
++            let lower_rects: Vec<(usize, PictureRect)> = (0 .. top)
++                .filter_map(|lower| {
++                    let rect: PictureRect = pic_to_root[lower]?.unmap_rect(&root_rect);
++                    Some((lower, rect))
++                })
++                .collect();
++
++            let needs_update = moved[top] ||
++                slice_is_dirty_in_rect(&tile_caches[&slice_ids[top]], &backdrop_rect) ||
++                lower_rects.iter().any(|(lower, rect)| {
++                    moved[*lower] || slice_is_dirty_in_rect(&tile_caches[&slice_ids[*lower]], rect)
++                });
++
++            if !needs_update {
++                continue;
++            }
++
++            invalidate_slice_rect(
++                tile_caches.get_mut(&slice_ids[top]).unwrap(),
++                &backdrop_rect,
++                supports_dirty_rects,
++                false,
++            );
++
++            for (lower, rect) in lower_rects {
++                invalidate_slice_rect(
++                    tile_caches.get_mut(&slice_ids[lower]).unwrap(),
++                    &rect,
++                    supports_dirty_rects,
++                    true,
++                );
++            }
++        }
++    }
++}
++
+ /// A SubSlice represents a potentially overlapping set of tiles within a picture cache. Most
+ /// picture cache instances will have only a single sub-slice. The exception to this is when
+ /// a picture cache has compositor surfaces, in which case sub slices are used to interleave
+diff --git a/gfx/wr/webrender/src/tile_cache/slice_builder.rs b/gfx/wr/webrender/src/tile_cache/slice_builder.rs
+index f81edc9..d8759bc 100644
+--- a/gfx/wr/webrender/src/tile_cache/slice_builder.rs
++++ b/gfx/wr/webrender/src/tile_cache/slice_builder.rs
+@@ -688,6 +688,7 @@ fn create_tile_cache(
+         virtual_surface_size: frame_builder_config.compositor_kind.get_virtual_surface_size(),
+         image_surface_count: prim_list.image_surface_count,
+         yuv_image_surface_count: prim_list.yuv_image_surface_count,
++        backdrop_reads_lower_slices: iframe_clip.is_none() && slice > 0,
+     });
+ 
+     let pic_index = prim_store.pictures.alloc().init(PictureInstance::new_image(

src/external-patches/firefox/bug_2011236.patch

@@ -1,166 +0,0 @@
-diff --git a/browser/components/sessionstore/test/browser.toml b/browser/components/sessionstore/test/browser.toml
---- a/browser/components/sessionstore/test/browser.toml
-+++ b/browser/components/sessionstore/test/browser.toml
-@@ -14,10 +14,12 @@
-   "browser_frame_history_c.html",
-   "browser_frame_history_c1.html",
-   "browser_frame_history_c2.html",
-   "browser_formdata_format_sample.html",
-   "browser_sessionHistory_slow.sjs",
-+  "browser_policy_container_sample.html",
-+  "browser_policy_container_sample_frame.html",
-   "browser_scrollPositions_sample.html",
-   "browser_scrollPositions_sample2.html",
-   "browser_scrollPositions_sample_frameset.html",
-   "browser_scrollPositions_readerModeArticle.html",
-   "browser_sessionStorage.html",
-@@ -226,10 +228,12 @@
- ["browser_pinned_tabs.js"]
- skip-if = [
-   "ccov", # Bug 1625525
- ]
- 
-+["browser_policy_container_not_stored.js"]
-+
- ["browser_privatetabs.js"]
- 
- ["browser_purge_domaindata.js"]
- 
- ["browser_purge_shistory.js"]
-diff --git a/browser/components/sessionstore/test/browser_policy_container_not_stored.js b/browser/components/sessionstore/test/browser_policy_container_not_stored.js
-new file mode 100644
---- /dev/null
-+++ b/browser/components/sessionstore/test/browser_policy_container_not_stored.js
-@@ -0,0 +1,51 @@
-+/* This Source Code Form is subject to the terms of the Mozilla Public
-+ * License, v. 2.0. If a copy of the MPL was not distributed with this
-+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-+
-+"use strict";
-+
-+/**
-+ * A session history entry only needs to retain the policy container for loads
-+ * that inherit their policies (about:blank, about:srcdoc, blob:, data:, ...).
-+ * Anything fetched over the network gets its policies from the response again,
-+ * so storing them would only bloat the session store (bug 2011236).
-+ */
-+
-+const TEST_ROOT = getRootDirectory(gTestPath).replace(
-+  "chrome://mochitests/content",
-+  "https://example.com"
-+);
-+const PARENT_URL = TEST_ROOT + "browser_policy_container_sample.html";
-+const FRAME_URL = TEST_ROOT + "browser_policy_container_sample_frame.html";
-+
-+add_task(async function test_policy_container_only_for_inheriting_loads() {
-+  const tab = BrowserTestUtils.addTab(gBrowser, PARENT_URL);
-+  gBrowser.selectedTab = tab;
-+  await promiseBrowserLoaded(tab.linkedBrowser, true, PARENT_URL);
-+  await TabStateFlusher.flush(tab.linkedBrowser);
-+
-+  const state = JSON.parse(ss.getTabState(tab));
-+  const topEntry = state.entries.at(-1);
-+  is(topEntry.url, PARENT_URL, "collected the parent entry");
-+
-+  const children = topEntry.children ?? [];
-+  const networkFrame = children.find(child => child.url === FRAME_URL);
-+  const blankFrame = children.find(child => child.url === "about:blank");
-+
-+  ok(networkFrame, "collected the network-scheme subframe entry");
-+  ok(blankFrame, "collected the about:blank subframe entry");
-+
-+  // The parent has a CSP, so both subframes inherit a policy container onto
-+  // their load state. Only the one that cannot recover it from a response
-+  // should keep it in session history.
-+  ok(
-+    !("policyContainer" in networkFrame),
-+    "https subframe entry does not store a policyContainer"
-+  );
-+  ok(
-+    "policyContainer" in blankFrame,
-+    "about:blank subframe entry still stores its inherited policyContainer"
-+  );
-+
-+  await BrowserTestUtils.removeTab(tab);
-+});
-diff --git a/browser/components/sessionstore/test/browser_policy_container_sample.html b/browser/components/sessionstore/test/browser_policy_container_sample.html
-new file mode 100644
---- /dev/null
-+++ b/browser/components/sessionstore/test/browser_policy_container_sample.html
-@@ -0,0 +1,12 @@
-+<!DOCTYPE html>
-+<html>
-+<head>
-+  <meta charset="utf-8">
-+  <meta http-equiv="Content-Security-Policy" content="default-src * data: blob: 'unsafe-inline'">
-+  <title>policyContainer session store sample</title>
-+</head>
-+<body>
-+  <iframe id="network" src="browser_policy_container_sample_frame.html"></iframe>
-+  <iframe id="blank" src="about:blank"></iframe>
-+</body>
-+</html>
-diff --git a/browser/components/sessionstore/test/browser_policy_container_sample_frame.html b/browser/components/sessionstore/test/browser_policy_container_sample_frame.html
-new file mode 100644
---- /dev/null
-+++ b/browser/components/sessionstore/test/browser_policy_container_sample_frame.html
-@@ -0,0 +1,10 @@
-+<!DOCTYPE html>
-+<html>
-+<head>
-+  <meta charset="utf-8">
-+  <title>policyContainer session store sample frame</title>
-+</head>
-+<body>
-+  frame
-+</body>
-+</html>
-diff --git a/docshell/shistory/SessionHistoryEntry.cpp b/docshell/shistory/SessionHistoryEntry.cpp
---- a/docshell/shistory/SessionHistoryEntry.cpp
-+++ b/docshell/shistory/SessionHistoryEntry.cpp
-@@ -41,10 +41,18 @@
- extern mozilla::LazyLogModule gSHLog;
- 
- namespace mozilla {
- namespace dom {
- 
-+// Only store policy container for loads that can't carry it themselves
-+// (about:blank, about:srcdoc, blob:, data:, ...)
-+// bug 1867137, bug 2011236
-+static nsIPolicyContainer* PolicyContainerToStore(
-+    nsIURI* aURI, nsIPolicyContainer* aPolicyContainer) {
-+  return CSP_ShouldURIInheritCSP(aURI) ? aPolicyContainer : nullptr;
-+}
-+
- SessionHistoryInfo::SessionHistoryInfo(nsDocShellLoadState* aLoadState,
-                                        nsIChannel* aChannel)
-     : mURI(aLoadState->URI()),
-       mOriginalURI(aLoadState->OriginalURI()),
-       mResultPrincipalURI(aLoadState->ResultPrincipalURI()),
-@@ -59,9 +67,10 @@
-       mLoadReplace(aLoadState->LoadReplace()),
-       mHasUserActivation(aLoadState->HasValidUserGestureActivation()),
-       mSharedState(SharedState::Create(
-           aLoadState->TriggeringPrincipal(), aLoadState->PrincipalToInherit(),
-           aLoadState->PartitionedPrincipalToInherit(),
--          aLoadState->PolicyContainer(),
-+          PolicyContainerToStore(aLoadState->URI(),
-+                                 aLoadState->PolicyContainer()),
-           /* FIXME Is this correct? */
-           aLoadState->TypeHint())) {
-   // Pull the upload stream off of the channel instead of the load state, as
-@@ -124,11 +133,12 @@
-   loadInfo->GetPrincipalToInherit(
-       getter_AddRefs(mSharedState.Get()->mPrincipalToInherit));
- 
-   mSharedState.Get()->mPartitionedPrincipalToInherit =
-       aPartitionedPrincipalToInherit;
--  mSharedState.Get()->mPolicyContainer = aPolicyContainer;
-+  mSharedState.Get()->mPolicyContainer =
-+      PolicyContainerToStore(mURI, aPolicyContainer);
-   aChannel->GetContentType(mSharedState.Get()->mContentType);
-   aChannel->GetOriginalURI(getter_AddRefs(mOriginalURI));
- 
-   uint32_t loadFlags;
-   aChannel->GetLoadFlags(&loadFlags);
-

src/external-patches/firefox/issue_14710.patch

@@ -1,7 +1,24 @@
 diff --git a/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs b/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs
 --- a/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs
 +++ b/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs
-@@ -119,10 +119,19 @@
+@@ -39,10 +39,16 @@
+ const TOGGLE_POSITION_PREF =
+   "media.videocontrols.picture-in-picture.video-toggle.position";
+ const TOGGLE_POSITION_RIGHT = "right";
+ const TOGGLE_POSITION_LEFT = "left";
+ const RESIZE_MARGIN_PX = 16;
++// Close reasons that should suppress auto-toggle when the originating tab is backgrounded
++const DELIBERATE_CLOSE_REASONS = [
++  "CloseButton",
++  "ClosePlayerShortcut",
++  "Shortcut",
++];
+ 
+ XPCOMUtils.defineLazyPreferenceGetter(
+   lazy,
+   "PIP_ENABLED",
+   "media.videocontrols.picture-in-picture.enabled",
+@@ -119,10 +125,19 @@
        }
        case "PictureInPicture:VideoTabHidden": {
          if (!lazy.PIP_ENABLED || !lazy.PIP_WHEN_SWITCHING_TABS) {
@@ -21,12 +38,13 @@ diff --git a/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs b/tool
            break;
          }
          let actor = browsingContext.currentWindowGlobal.getActor(
-@@ -261,10 +270,12 @@
+@@ -261,10 +276,13 @@
    maxConcurrentPlayerCount: 0,
  
    // Maps auto pip browser to PictureInPictureParent actor
    weakAutoPipBrowserToParent: new WeakMap(),
  
++  // Browsers with deliberately closed PiP windows; suppresses auto-toggle.
 +  weakAutoPipBrowserClosedDeliberately: new WeakSet(),
 +
    /**
@@ -34,7 +52,28 @@ diff --git a/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs b/tool
     *
     * @param {PictureInPictureParent} pipActorRef
     *   Reference to the calling PictureInPictureParent actor
-@@ -899,10 +910,17 @@
+@@ -441,10 +459,20 @@
+   },
+ 
+   onPipSwappedBrowsers(event) {
+     let otherTab = event.detail;
+     if (otherTab) {
++      if (
++        this.weakAutoPipBrowserClosedDeliberately.has(
++          event.target.linkedBrowser
++        )
++      ) {
++        this.weakAutoPipBrowserClosedDeliberately.add(otherTab.linkedBrowser);
++        this.weakAutoPipBrowserClosedDeliberately.delete(
++          event.target.linkedBrowser
++        );
++      }
+       for (let win of Services.wm.getEnumerator(WINDOW_TYPE)) {
+         if (this.weakWinToBrowser.get(win) === event.target.linkedBrowser) {
+           this.weakWinToBrowser.set(win, otherTab.linkedBrowser);
+           this.removePiPBrowserFromWeakMap(event.target.linkedBrowser);
+           this.removeOriginatingWinFromWeakMap(event.target.linkedBrowser);
+@@ -899,10 +927,20 @@
      const { reason, actorRef } = closeData;
      const win = this.getWeakPipPlayer(actorRef);
      if (!win) {
@@ -43,8 +82,11 @@ diff --git a/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs b/tool
 +
 +    const browser = this.weakWinToBrowser.get(win);
 +
-+    if (reason === "CloseButton") {
-+      PictureInPicture.weakAutoPipBrowserClosedDeliberately.add(browser);
++    if (browser && DELIBERATE_CLOSE_REASONS.includes(reason)) {
++      const tabbrowser = browser.getTabBrowser();
++      if (tabbrowser && tabbrowser.selectedBrowser != browser) {
++        PictureInPicture.weakAutoPipBrowserClosedDeliberately.add(browser);
++      }
 +    }
 +
      this.removePiPBrowserFromWeakMap(this.weakWinToBrowser.get(win));
@@ -52,4 +94,69 @@ diff --git a/toolkit/components/pictureinpicture/PictureInPicture.sys.mjs b/tool
  
      Glean.pictureinpicture["closedMethod" + reason].record();
      await this.closePipWindow(win);
+diff --git a/toolkit/components/pictureinpicture/tests/browser_autotoggle.js b/toolkit/components/pictureinpicture/tests/browser_autotoggle.js
+--- a/toolkit/components/pictureinpicture/tests/browser_autotoggle.js
++++ b/toolkit/components/pictureinpicture/tests/browser_autotoggle.js
+@@ -297,5 +297,61 @@
+       await new Promise(resolve => setTimeout(resolve, 2000));
+       assertNoPiPWindowsOpen();
+     }
+   );
+ });
++
++/**
++ * Tests that closing a PiP window deliberately (via Shift+ESC) while the tab is backgrounded
++ * suppresses auto-toggle, but auto-toggle works normally on the next background.
++ */
++add_task(async function autopip_suppress_on_deliberate_close() {
++  await SpecialPowers.pushPrefEnv({
++    set: [[ALWAYS_SHOW_PREF, true]],
++  });
++
++  // Open a new window and save a handle for the first tab
++  let win1 = await BrowserTestUtils.openNewBrowserWindow();
++  let firstTab = win1.gBrowser.selectedTab;
++
++  // Open a new tab containing a video
++  let pipTab = await BrowserTestUtils.openNewForegroundTab(
++    win1.gBrowser,
++    TEST_PAGE
++  );
++  let browser = pipTab.linkedBrowser;
++
++  // Ensure the video is playing
++  let videoID = "with-controls";
++  await ensureVideosReady(browser);
++  await SpecialPowers.spawn(browser, [videoID], async videoID => {
++    await content.document.getElementById(videoID).play();
++  });
++
++  // Switch from the video tab to the first tab and check if the PiP window opened
++  let domWindowOpened = BrowserTestUtils.domWindowOpenedAndLoaded(null);
++  await BrowserTestUtils.switchTab(win1.gBrowser, firstTab);
++  let pipWin = await domWindowOpened;
++  ok(pipWin, "PiP window automatically opened.");
++
++  // Close the PiP window deliberately while the tab is backgrounded and check that it doesn't reopen
++  domWindowOpened = BrowserTestUtils.domWindowOpenedAndLoaded(null);
++  // A short delay is needed to make the test more robust
++  // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
++  await new Promise(resolve => setTimeout(resolve, 2000));
++  EventUtils.synthesizeKey("KEY_Escape", { shiftKey: true }, pipWin);
++  let reopened = await Promise.race([
++    domWindowOpened.then(() => true),
++    // eslint-disable-next-line mozilla/no-arbitrary-setTimeout
++    new Promise(resolve => setTimeout(() => resolve(false), 2000)),
++  ]);
++  ok(!reopened, "PiP window should not reopen after deliberate close");
++
++  // Switch to the video tab and back to the first tab, which should automatically open the PiP window
++  domWindowOpened = BrowserTestUtils.domWindowOpenedAndLoaded(null);
++  await BrowserTestUtils.switchTab(win1.gBrowser, pipTab);
++  await BrowserTestUtils.switchTab(win1.gBrowser, firstTab);
++  pipWin = await domWindowOpened;
++  ok(pipWin, "PiP window automatically opened.");
++
++  await BrowserTestUtils.closeWindow(win1);
++});
 

src/external-patches/firefox/issue_15123.patch

@@ -0,0 +1,131 @@
+diff --git a/toolkit/modules/subprocess/subprocess_shared_unix.js b/toolkit/modules/subprocess/subprocess_shared_unix.js
+--- a/toolkit/modules/subprocess/subprocess_shared_unix.js
++++ b/toolkit/modules/subprocess/subprocess_shared_unix.js
+@@ -57,11 +57,11 @@
+   fcntl: [
+     ctypes.default_abi,
+     ctypes.int,
+     ctypes.int /* fildes */,
+     ctypes.int /* cmd */,
+-    ctypes.int /* ... */,
++    "...",
+   ],
+ 
+   getcwd: [
+     ctypes.default_abi,
+     ctypes.char.ptr,
+diff --git a/toolkit/modules/subprocess/subprocess_unix.sys.mjs b/toolkit/modules/subprocess/subprocess_unix.sys.mjs
+--- a/toolkit/modules/subprocess/subprocess_unix.sys.mjs
++++ b/toolkit/modules/subprocess/subprocess_unix.sys.mjs
+@@ -34,13 +34,13 @@
+       throw new Error("Unable to create pipe");
+     }
+ 
+     this.signalFd = fds[1];
+ 
+-    libc.fcntl(fds[0], LIBC.F_SETFL, LIBC.O_NONBLOCK);
+-    libc.fcntl(fds[0], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
+-    libc.fcntl(fds[1], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
++    libc.fcntl(fds[0], LIBC.F_SETFL, ctypes.int(LIBC.O_NONBLOCK));
++    libc.fcntl(fds[0], LIBC.F_SETFD, ctypes.int(LIBC.FD_CLOEXEC));
++    libc.fcntl(fds[1], LIBC.F_SETFD, ctypes.int(LIBC.FD_CLOEXEC));
+ 
+     this.call("init", [{ signalFd: fds[0] }]);
+   }
+ 
+   closePipe() {
+diff --git a/toolkit/modules/subprocess/subprocess_unix.worker.js b/toolkit/modules/subprocess/subprocess_unix.worker.js
+--- a/toolkit/modules/subprocess/subprocess_unix.worker.js
++++ b/toolkit/modules/subprocess/subprocess_unix.worker.js
+@@ -349,13 +349,13 @@
+         our_pipes.push(new InputPipe(this, fds[1]));
+       } else {
+         our_pipes.push(new OutputPipe(this, fds[1]));
+       }
+ 
+-      libc.fcntl(fds[0], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
+-      libc.fcntl(fds[1], LIBC.F_SETFD, LIBC.FD_CLOEXEC);
+-      libc.fcntl(fds[1], LIBC.F_SETFL, LIBC.O_NONBLOCK);
++      libc.fcntl(fds[0], LIBC.F_SETFD, ctypes.int(LIBC.FD_CLOEXEC));
++      libc.fcntl(fds[1], LIBC.F_SETFD, ctypes.int(LIBC.FD_CLOEXEC));
++      libc.fcntl(fds[1], LIBC.F_SETFL, ctypes.int(LIBC.O_NONBLOCK));
+ 
+       return fds[0];
+     };
+ 
+     their_pipes.set(0, pipe(false));
+diff --git a/toolkit/modules/subprocess/test/xpcshell/test_subprocess_pipe_flags.js b/toolkit/modules/subprocess/test/xpcshell/test_subprocess_pipe_flags.js
+new file mode 100644
+--- /dev/null
++++ b/toolkit/modules/subprocess/test/xpcshell/test_subprocess_pipe_flags.js
+@@ -0,0 +1,56 @@
++/* This Source Code Form is subject to the terms of the Mozilla Public
++ * License, v. 2.0. If a copy of the MPL was not distributed with this
++ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
++
++"use strict";
++
++// fcntl commands for reading the flags set by the subprocess modules. The
++// values are the same on Linux and macOS but are not exposed by
++// ChromeUtils.getLibcConstants().
++const F_GETFD = 1;
++const F_GETFL = 3;
++
++add_task(async function test_subprocess_pipe_flags() {
++  const { getSubprocessImplForTest } = ChromeUtils.importESModule(
++    "resource://gre/modules/Subprocess.sys.mjs"
++  );
++  const { libc } = ChromeUtils.importESModule(
++    "resource://gre/modules/subprocess/subprocess_unix.sys.mjs"
++  );
++  const { FD_CLOEXEC, O_NONBLOCK } = ChromeUtils.getLibcConstants();
++
++  const worker = getSubprocessImplForTest().Process.getWorker();
++  equal(
++    libc.fcntl(worker.signalFd, F_GETFD),
++    FD_CLOEXEC,
++    "The main-thread signal pipe has exactly FD_CLOEXEC set"
++  );
++
++  const proc = await Subprocess.call({
++    command: await Subprocess.pathSearch("cat"),
++    stderr: "pipe",
++  });
++  const fds = await worker.call("getFds", [proc.id]);
++  ok(
++    fds.every(Number.isInteger),
++    "The worker owns the stdin, stdout and stderr pipes"
++  );
++  for (const fd of fds) {
++    equal(
++      libc.fcntl(fd, F_GETFD),
++      FD_CLOEXEC,
++      "Worker pipes have exactly FD_CLOEXEC set"
++    );
++    equal(
++      libc.fcntl(fd, F_GETFL) & O_NONBLOCK,
++      O_NONBLOCK,
++      "Worker pipes are nonblocking"
++    );
++  }
++
++  const output = proc.stdout.readString(5);
++  await proc.stdin.write("hello");
++  equal(await output, "hello", "The subprocess pipes transfer data");
++  await proc.stdin.close();
++  equal((await proc.wait()).exitCode, 0, "The subprocess exits cleanly");
++});
+diff --git a/toolkit/modules/subprocess/test/xpcshell/xpcshell.toml b/toolkit/modules/subprocess/test/xpcshell/xpcshell.toml
+--- a/toolkit/modules/subprocess/test/xpcshell/xpcshell.toml
++++ b/toolkit/modules/subprocess/test/xpcshell/xpcshell.toml
+@@ -25,6 +25,9 @@
+ ["test_subprocess_pathSearch.js"]
+ 
+ ["test_subprocess_perf.js"]
+ requesttimeoutfactor = 2  # Slow on Windows
+ 
++["test_subprocess_pipe_flags.js"]
++skip-if = ["os == 'win'"]
++
+ ["test_subprocess_polling.js"]
+

src/external-patches/firefox/native_macos_popovers_fix.patch

@@ -1,9 +1,8 @@
 diff --git a/toolkit/themes/shared/global-shared.css b/toolkit/themes/shared/global-shared.css
 --- a/toolkit/themes/shared/global-shared.css
 +++ b/toolkit/themes/shared/global-shared.css
-@@ -80,11 +80,10 @@
+@@ -80,10 +80,9 @@
      background-color: transparent;
-     --panel-background: transparent;
      --panel-box-shadow: none;
      --panel-border-color: transparent;
      --panel-box-shadow-margin: 0px;

src/external-patches/firefox/override_cert_checks_temp.patch

@@ -0,0 +1,32 @@
+diff --git a/toolkit/mozapps/update/common/registrycertificates.cpp b/toolkit/mozapps/update/common/registrycertificates.cpp
+index f7f5acdfa08879a0ff3095e15eebf7b436cf5092..5915141b3f4a6d3536841cc1040e70afe033e058 100644
+--- a/toolkit/mozapps/update/common/registrycertificates.cpp
++++ b/toolkit/mozapps/update/common/registrycertificates.cpp
+@@ -33,9 +33,21 @@
+  *
+  * @return TRUE if the binary matches any of the allowed certificates.
+  */
++// TEMPORARY: accept any binary without consulting the allowed-certificate
++// values. Those values are only ever written by an installer run, so after a
++// signing certificate change every existing install still names the previous
++// certificate, the maintenance service refuses the newly signed binaries, and
++// updates fall back to prompting for elevation every time. Remove this define
++// and the block below once installs have been migrated.
++#define ZEN_SKIP_ALLOWED_CERTIFICATE_CHECK 1
++
+ BOOL DoesBinaryMatchAllowedCertificates(LPCWSTR basePathForUpdate,
+                                         LPCWSTR filePath,
+                                         BOOL allowFallbackKeySkip) {
++#ifdef ZEN_SKIP_ALLOWED_CERTIFICATE_CHECK
++  LOG(("Skipping the allowed certificate check for \"%ls\"", filePath));
++  return TRUE;
++#else
+ #ifdef DISABLE_UPDATER_AUTHENTICODE_CHECK
+   if (allowFallbackKeySkip) {
+     LOG_WARN(("Skipping authenticode check"));
+@@ -163,4 +175,5 @@ BOOL DoesBinaryMatchAllowedCertificates(LPCWSTR basePathForUpdate,
+   RegCloseKey(baseKey);
+   // No certificates match, :'(
+   return FALSE;
++#endif  // ZEN_SKIP_ALLOWED_CERTIFICATE_CHECK
+ }

src/external-patches/manifest.json

@@ -8,10 +8,14 @@
     "name": "Native MacOS popovers fix"
   },
   {
-    "type": "local",
-    // TODO: Convert into https://phabricator.services.mozilla.com/D298079
-    //    once it gets accepted.
-    "path": "firefox/allow_backdrop_to_work_on_transparency.patch"
+    "type": "phabricator",
+    "id": "D323933",
+    "name": "Issue 15123"
+  },
+  {
+    "type": "phabricator",
+    "id": "D327914",
+    "name": "Backdrop filter reads web content"
   },
   {
     "type": "local",
@@ -41,17 +45,6 @@
       "          jsonLengthHint,": "          lengthHint: jsonLengthHint,"
     }
   },
-  {
-    "type": "phabricator",
-    "id": "D320897",
-    "name": "Bug 2011236",
-    "replaces": {
-      // The upstream patch context includes a MOZ_DIAGNOSTIC_ASSERT that
-      // doesn't exist yet in our Firefox version.
-      "@@ -59,11 +67,12 @@": "@@ -59,9 +67,10 @@",
-      "aLoadState->TypeHint())) {\n   MOZ_DIAGNOSTIC_ASSERT(!mURI->SchemeIs(\"javascript\"));\n \n   // Pull": "aLoadState->TypeHint())) {\n   // Pull"
-    }
-  },
   {
     "type": "phabricator",
     "id": "D321446",
@@ -59,16 +52,6 @@
   },
   {
     "type": "local",
-    // CSS corner-shape rendering stack from bug 2047627 (borders),
-    // bug 2048908 (box shadows) and bug 2058091 (inset), squashed into a
-    // single patch: surfer's revert-then-apply on re-import only works for
-    // independently revertible patches, so a stack of separate files fails.
-    // Combined revisions, in stack order: D313684, D314332-D314337,
-    // D316301-D316304, D317056-D317058. The earlier revisions of these
-    // bugs (D306773-D306779, D308243, D311523) already landed in the
-    // current Firefox version and are omitted. D314332, D314336, D316301,
-    // D316303, D316304, D317057 and D317058 are hand-rebased onto
-    // Firefox 154 (the upstream diffs target a newer mozilla-central).
-    "path": "firefox/css_corner_shape_rendering.patch"
+    "path": "firefox/override_cert_checks_temp.patch"
   }
 ]

src/layout/painting/nsImageRenderer-cpp.patch

@@ -1,8 +1,8 @@
 diff --git a/layout/painting/nsImageRenderer.cpp b/layout/painting/nsImageRenderer.cpp
-index 6e464b48c90174b8954aad8a79bae30a7a30cbc9..9ea9a4963ceae679f092e014ac24a0d24fb106ce 100644
+index 7ddc4f7e259272e7b905f44aff7316c1ba540c22..277a92e5d10e6a04b12373854ffe6791d562215e 100644
 --- a/layout/painting/nsImageRenderer.cpp
 +++ b/layout/painting/nsImageRenderer.cpp
-@@ -90,7 +90,7 @@ static already_AddRefed<imgIContainer> GetSymbolicIconImage(nsAtom* aName,
+@@ -95,7 +95,7 @@ static already_AddRefed<imgIContainer> GetSymbolicIconImage(nsAtom* aName,
    if (NS_WARN_IF(!XRE_IsParentProcess())) {
      return nullptr;
    }
@@ -11,7 +11,7 @@ index 6e464b48c90174b8954aad8a79bae30a7a30cbc9..9ea9a4963ceae679f092e014ac24a0d2
    auto key = std::make_tuple(aName, aScale, fg);
    auto* cache = aFrame->GetOrCreateDeletableProperty(SymbolicImageCacheProp());
    auto lookup = cache->Lookup(key);
-@@ -575,7 +575,7 @@ ImgDrawResult nsImageRenderer::Draw(nsPresContext* aPresContext,
+@@ -580,7 +580,7 @@ ImgDrawResult nsImageRenderer::Draw(nsPresContext* aPresContext,
      }
      case StyleImage::Tag::Gradient: {
        nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
@@ -20,7 +20,7 @@ index 6e464b48c90174b8954aad8a79bae30a7a30cbc9..9ea9a4963ceae679f092e014ac24a0d2
  
        renderer.Paint(*ctx, aDest, aFill, aRepeatSize, aSrc, aDirtyRect,
                       aOpacity);
-@@ -652,7 +652,7 @@ ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
+@@ -657,7 +657,7 @@ ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
    switch (mType) {
      case StyleImage::Tag::Gradient: {
        nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(
@@ -29,16 +29,16 @@ index 6e464b48c90174b8954aad8a79bae30a7a30cbc9..9ea9a4963ceae679f092e014ac24a0d2
  
        renderer.BuildWebRenderDisplayItems(aBuilder, aSc, aDest, aFill,
                                            aRepeatSize, aSrc,
-@@ -678,6 +678,8 @@ ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
-           nsPresContext::AppUnitsToIntCSSPixels(aDest.height)};
+@@ -679,6 +679,8 @@ ImgDrawResult nsImageRenderer::BuildWebRenderDisplayItems(
+       }
  
-       SVGImageContext svgContext(Some(destCSSSize));
+       SVGImageContext svgContext(Some(CSSSize::FromAppUnits(aDest.Size())));
 +      SVGImageContext::MaybeStoreZenBoosts(svgContext,
 +                                           *mForFrame->PresContext());
        Maybe<ImageIntRegion> region;
  
        const int32_t appUnitsPerDevPixel = aPresContext->AppUnitsPerDevPixel();
-@@ -1092,7 +1094,7 @@ ImgDrawResult nsImageRenderer::DrawShapeImage(nsPresContext* aPresContext,
+@@ -1098,7 +1100,7 @@ ImgDrawResult nsImageRenderer::DrawShapeImage(nsPresContext* aPresContext,
  
    if (mImage->IsGradient()) {
      nsCSSGradientRenderer renderer = nsCSSGradientRenderer::Create(

src/layout/style/StyleColor-cpp.patch

@@ -1,16 +1,16 @@
 diff --git a/layout/style/StyleColor.cpp b/layout/style/StyleColor.cpp
-index bbee32af30f35525730a10d0b242c0e8a8fe4695..a590fff105b30bc96fa7a0d8a8d3b1d5aa997e08 100644
+index f922f7fdacc7e1a14beb8da77b48aef3f6ae0b2b..47d19242baaf2a1f25ee07c6e210c839cc7b5089 100644
 --- a/layout/style/StyleColor.cpp
 +++ b/layout/style/StyleColor.cpp
-@@ -9,6 +9,7 @@
- #include "mozilla/dom/BindingDeclarations.h"
+@@ -8,6 +8,7 @@
+ #include "mozilla/StyleColorInlines.h"
  #include "nsIFrame.h"
  #include "nsStyleStruct.h"
 +#include "mozilla/nsZenBoostsBackend.h"
+ #include "nsStyleUtil.h"
  
  namespace mozilla {
- 
-@@ -96,23 +97,24 @@ StyleAbsoluteColor StyleColor::ResolveColor(
+@@ -98,23 +99,24 @@ StyleAbsoluteColor StyleColor::ResolveColor(
  
  template <>
  nscolor StyleColor::CalcColor(nscolor aColor) const {
@@ -40,7 +40,7 @@ index bbee32af30f35525730a10d0b242c0e8a8fe4695..a590fff105b30bc96fa7a0d8a8d3b1d5
  }
  
  StyleAbsoluteColor StyleAbsoluteColor::ToColorSpace(
-@@ -120,7 +122,7 @@ StyleAbsoluteColor StyleAbsoluteColor::ToColorSpace(
+@@ -122,7 +124,7 @@ StyleAbsoluteColor StyleAbsoluteColor::ToColorSpace(
    return Servo_ConvertColorSpace(this, aColorSpace);
  }
  
@@ -49,7 +49,7 @@ index bbee32af30f35525730a10d0b242c0e8a8fe4695..a590fff105b30bc96fa7a0d8a8d3b1d5
    constexpr StyleColorSpace DEST_COLOR_SPACE = StyleColorSpace::Srgb;
  
    constexpr float MIN = 0.0f;
-@@ -162,11 +164,13 @@ nscolor StyleAbsoluteColor::ToColor() const {
+@@ -164,11 +166,13 @@ nscolor StyleAbsoluteColor::ToColor() const {
      }
    }
  

src/layout/svg/SVGGradientFrame-cpp.patch

@@ -1,8 +1,8 @@
 diff --git a/layout/svg/SVGGradientFrame.cpp b/layout/svg/SVGGradientFrame.cpp
-index b0d38b0fab01797328af0b1f1f48af8fb5eebe4d..953feffdc96143dc2d8f8e57f8bb4a6aeb33f0c5 100644
+index eebcced86ec1e9010b761d5df4a92684dde44009..4dc018a73a979f50ac7842e4a3f3fcf9d0071b56 100644
 --- a/layout/svg/SVGGradientFrame.cpp
 +++ b/layout/svg/SVGGradientFrame.cpp
-@@ -229,8 +229,9 @@ class MOZ_STACK_CLASS SVGColorStopInterpolator
+@@ -228,8 +228,9 @@ class MOZ_STACK_CLASS SVGColorStopInterpolator
    SVGColorStopInterpolator(
        gfxPattern* aGradient, const nsTArray<ColorStop>& aStops,
        const StyleColorInterpolationMethod& aStyleColorInterpolationMethod,
@@ -14,8 +14,8 @@ index b0d38b0fab01797328af0b1f1f48af8fb5eebe4d..953feffdc96143dc2d8f8e57f8bb4a6a
          mGradient(aGradient) {}
  
    void CreateStop(float aPosition, DeviceColor aColor) {
-@@ -270,7 +271,8 @@ already_AddRefed<gfxPattern> SVGGradientFrame::GetPaintServerPattern(
-   if (nStops == 1 || GradientVectorLengthIsZero()) {
+@@ -269,7 +270,8 @@ already_AddRefed<gfxPattern> SVGGradientFrame::GetPaintServerPattern(
+   if (nStops == 1 || GradientVectorLengthIsZero(gradientUnits)) {
      // The gradient paints a single colour, using the stop-color of the last
      // gradient step if there are more than one.
 -    return MakeAndAddRef<gfxPattern>(ToDeviceColor(stops.LastElement().mColor));

src/layout/svg/SVGImageContext-h.patch

@@ -1,5 +1,5 @@
 diff --git a/layout/svg/SVGImageContext.h b/layout/svg/SVGImageContext.h
-index b1f811989697966e30859610f4fc07579d0385ab..f6f4cd5a45fc49b416111d980fab4e612788903e 100644
+index 63f3c4926cfdb8b12e9e4a38016fc66f50cf3129..5ba3f2c07f521905a086ee6eea87975d5a3441ec 100644
 --- a/layout/svg/SVGImageContext.h
 +++ b/layout/svg/SVGImageContext.h
 @@ -6,6 +6,7 @@
@@ -7,10 +7,10 @@ index b1f811989697966e30859610f4fc07579d0385ab..f6f4cd5a45fc49b416111d980fab4e61
  
  #include "Units.h"
 +#include "nsColor.h"
+ #include "mozilla/Casting.h"
  #include "mozilla/Maybe.h"
  #include "mozilla/SVGContextPaint.h"
- #include "mozilla/SVGPreserveAspectRatio.h"
-@@ -63,6 +64,11 @@ class SVGImageContext {
+@@ -64,6 +65,11 @@ class SVGImageContext {
                                       nsISVGPaintContext* aPaintContext,
                                       imgIContainer* aImgContainer);
  
@@ -19,10 +19,10 @@ index b1f811989697966e30859610f4fc07579d0385ab..f6f4cd5a45fc49b416111d980fab4e61
 +  static void MaybeStoreZenBoosts(SVGImageContext& aContext,
 +                                  const nsPresContext& aPresContext);
 +
-   const Maybe<CSSIntSize>& GetViewportSize() const { return mViewportSize; }
+   const Maybe<CSSSize>& GetViewportSize() const { return mViewportSize; }
  
-   void SetViewportSize(const Maybe<CSSIntSize>& aSize) {
-@@ -75,6 +81,21 @@ class SVGImageContext {
+   void SetViewportSize(const Maybe<CSSSize>& aSize) { mViewportSize = aSize; }
+@@ -74,6 +80,21 @@ class SVGImageContext {
      mColorScheme = aScheme;
    }
  
@@ -44,7 +44,7 @@ index b1f811989697966e30859610f4fc07579d0385ab..f6f4cd5a45fc49b416111d980fab4e61
    const Maybe<SVGPreserveAspectRatio>& GetPreserveAspectRatio() const {
      return mPreserveAspectRatio;
    }
-@@ -116,7 +137,11 @@ class SVGImageContext {
+@@ -109,7 +130,11 @@ class SVGImageContext {
      return contextPaintIsEqual && mViewportSize == aOther.mViewportSize &&
             mPreserveAspectRatio == aOther.mPreserveAspectRatio &&
             mColorScheme == aOther.mColorScheme &&
@@ -56,18 +56,18 @@ index b1f811989697966e30859610f4fc07579d0385ab..f6f4cd5a45fc49b416111d980fab4e61
 +           mZenBoostsInverted == aOther.mZenBoostsInverted;
    }
  
-   bool operator!=(const SVGImageContext&) const = default;
-@@ -129,7 +154,8 @@ class SVGImageContext {
-     return HashGeneric(hash, mViewportSize.map(HashSize).valueOr(0),
-                        mPreserveAspectRatio.map(HashPAR).valueOr(0),
-                        mColorScheme.map(HashColorScheme).valueOr(0),
--                       HashLinkParameters(mLinkParameters));
-+                       HashLinkParameters(mLinkParameters), mZenBoostsAccent,
-+                       mZenBoostsComplementaryRotation, mZenBoostsInverted);
+   PLDHashNumber Hash() const {
+@@ -120,7 +145,8 @@ class SVGImageContext {
+     return AddToHash(hash, mViewportSize.map(HashSize).valueOr(0),
+                      mPreserveAspectRatio.map(HashPAR).valueOr(0),
+                      mColorScheme.map(HashColorScheme).valueOr(0),
+-                     HashLinkParameters(mLinkParameters));
++                     HashLinkParameters(mLinkParameters), mZenBoostsAccent,
++                     mZenBoostsComplementaryRotation, mZenBoostsInverted);
    }
  
   private:
-@@ -167,6 +193,9 @@ class SVGImageContext {
+@@ -154,6 +180,9 @@ class SVGImageContext {
    Maybe<SVGPreserveAspectRatio> mPreserveAspectRatio;
    Maybe<ColorScheme> mColorScheme;
    StyleLinkParameters mLinkParameters;

src/toolkit/content/widgets/moz-toggle/moz-toggle-tokens-css.patch

@@ -1,5 +1,5 @@
 diff --git a/toolkit/content/widgets/moz-toggle/moz-toggle.tokens.css b/toolkit/content/widgets/moz-toggle/moz-toggle.tokens.css
-index 6247d7a3923a6fedd4ec9911aba309ce565cd498..744e670eccc936dde664aa07df3e87bdcafd5e48 100644
+index c0976c54418a28046802443931042bd285aefbde..2adb18d25edbb8aac4e396fcfc64a4a664607836 100644
 --- a/toolkit/content/widgets/moz-toggle/moz-toggle.tokens.css
 +++ b/toolkit/content/widgets/moz-toggle/moz-toggle.tokens.css
 @@ -13,8 +13,8 @@
@@ -11,5 +11,5 @@ index 6247d7a3923a6fedd4ec9911aba309ce565cd498..744e670eccc936dde664aa07df3e87bd
 +    --toggle-background-color-pressed: var(--zen-primary-color);
 +    --toggle-background-color-pressed-hover: var(--zen-colors-hover-bg);
      --toggle-background-color-pressed-active: var(--color-accent-primary-active);
-     --toggle-border-color: var(--border-color-interactive);
+     --toggle-border-color: light-dark(var(--color-gray-70), var(--border-color-interactive));
      --toggle-border-color-hover: var(--toggle-border-color);

src/toolkit/content/widgets/panel-list/panel-list-mjs.patch

@@ -1,29 +0,0 @@
-diff --git a/toolkit/content/widgets/panel-list/panel-list.mjs b/toolkit/content/widgets/panel-list/panel-list.mjs
-index 68ad2fafc8b31dfff541cf8381d9b9533e376d1c..fa62fec6bfb33338091fc06d3736fb76fd5c47c4 100644
---- a/toolkit/content/widgets/panel-list/panel-list.mjs
-+++ b/toolkit/content/widgets/panel-list/panel-list.mjs
-@@ -223,7 +223,12 @@ export class PanelList extends HTMLElement {
-     this.setAttribute("showing", "true");
-     // Tell the host element to hide any overflow in case the panel extends off
-     // the page before the alignment is set.
--    hostElement.style.overflow = "hidden";
-+    const hostHidesOverflow = !getComputedStyle(hostElement)
-+      .overflow.split(" ")
-+      .includes("visible");
-+    if (!hostHidesOverflow) {
-+      hostElement.style.overflow = "hidden";
-+    }
- 
-     // Wait for a layout flush, then find the bounds.
-     let {
-@@ -344,7 +349,9 @@ export class PanelList extends HTMLElement {
-       // Set the alignments and show the panel.
-       this.setAttribute("align", align);
-       this.setAttribute("valign", valign);
--      hostElement.style.overflow = "";
-+      if (!hostHidesOverflow) {
-+        hostElement.style.overflow = "";
-+      }
-       // Decide positioning based on where this panel will be rendered
-       const offsetParentIsBody =
-         this.supportsPopover() ||

src/toolkit/themes/shared/design-system/dist/tokens-shared-css.patch

@@ -1,5 +1,5 @@
 diff --git a/toolkit/themes/shared/design-system/dist/tokens-shared.css b/toolkit/themes/shared/design-system/dist/tokens-shared.css
-index 15c0d98a18b4f19e7f2e03d2b78066b0353f416a..b32f6244c7a07e93894bab422691a605456034a1 100644
+index b0f8fa146de335c53e73d46853f45dda9b15cc73..1b7592c0e9ca12fd9d1f8a555633fd39c2efb537 100644
 --- a/toolkit/themes/shared/design-system/dist/tokens-shared.css
 +++ b/toolkit/themes/shared/design-system/dist/tokens-shared.css
 @@ -7,6 +7,8 @@
@@ -8,10 +8,25 @@ index 15c0d98a18b4f19e7f2e03d2b78066b0353f416a..b32f6244c7a07e93894bab422691a605
  
 +@import url("chrome://browser/content/zen-styles/zen-theme.css");
 +
- @layer tokens-foundation {
-   :root,
-   :host(.anonymous-content-host) {
-@@ -424,8 +426,8 @@
+ :root,
+ :host(.anonymous-content-host) {
+   @layer tokens-foundation {
+@@ -28,10 +30,10 @@
+     --border-color-selected: var(--color-accent-primary);
+     --border-color-transparent: transparent;
+     --border-radius-circle: 9999px;
+-    --border-radius-xsmall: 2px;
+-    --border-radius-small: 4px;
+-    --border-radius-medium: 8px;
+-    --border-radius-large: 16px;
++    --border-radius-xsmall: calc(2px * var(--zen-squircle-value));
++    --border-radius-small: calc(4px * var(--zen-squircle-value));
++    --border-radius-medium: calc(8px * var(--zen-squircle-value));
++    --border-radius-large: calc(16px * var(--zen-squircle-value));
+     --border-width: 1px;
+ 
+     /** box-shadow **/
+@@ -477,8 +479,8 @@
      --panel-background-color-dimmed-further: var(--background-color-dimmed-further);
      --panel-border-color: light-dark(rgb(240, 240, 244), rgb(82, 82, 94));
      --panel-border-radius: var(--border-radius-medium);

src/widget/cocoa/nsCocoaWindow-h.patch

@@ -1,8 +1,8 @@
 diff --git a/widget/cocoa/nsCocoaWindow.h b/widget/cocoa/nsCocoaWindow.h
-index 312011c1c2ac41e78affecbdef25d72766a7c882..e5865c7d6259f0a3df48edf7a26b1b75a23cdb3a 100644
+index 22a2a7ef3a5e9257c8bb00ba6a55e8d39d2abbd9..6d8353fd11921585f7101f5717bdb3dd8f2a5eae 100644
 --- a/widget/cocoa/nsCocoaWindow.h
 +++ b/widget/cocoa/nsCocoaWindow.h
-@@ -462,6 +462,10 @@ class nsCocoaWindow final : public nsIWidget {
+@@ -461,6 +461,10 @@ class nsCocoaWindow final : public nsIWidget {
    void SetHideTitlebarSeparator(bool) override;
    bool IsMacTitlebarDirectionRTL() override;
    void SetCustomTitlebar(bool) override;
@@ -13,9 +13,9 @@ index 312011c1c2ac41e78affecbdef25d72766a7c882..e5865c7d6259f0a3df48edf7a26b1b75
    void UpdateThemeGeometries(
        const nsTArray<ThemeGeometry>& aThemeGeometries) override;
    void LockAspectRatio(bool aShouldLock) override;
-@@ -672,6 +676,7 @@ class nsCocoaWindow final : public nsIWidget {
-   bool mAspectRatioLocked = false;
-   bool mIsAlert = false;  // True if this is an non-native alert window.
+@@ -674,6 +678,7 @@ class nsCocoaWindow final : public nsIWidget {
+   // show (e.g. a window created by detaching a tab from a fullscreen window).
+   bool mIsInitialFullscreenSuppressed = false;
    bool mWasShown = false;
 +  bool mIsBrowserWindow = false;
  

src/widget/cocoa/nsCocoaWindow-mm.patch

@@ -1,16 +1,17 @@
 diff --git a/widget/cocoa/nsCocoaWindow.mm b/widget/cocoa/nsCocoaWindow.mm
-index 2efd02e4a92433fd29bbfdb707aa81cfec45031e..3b763c3927f07e529c826f8e4f62bc80a324b247 100644
+index 887e4c052d5dd2b73d4c2059463529fb4b09dcab..36da18e19018b1b216576c299f938e75093546d3 100644
 --- a/widget/cocoa/nsCocoaWindow.mm
 +++ b/widget/cocoa/nsCocoaWindow.mm
-@@ -86,6 +86,7 @@
+@@ -86,6 +86,8 @@
  #include "mozilla/StaticPrefs_gfx.h"
  #include "mozilla/StaticPrefs_ui.h"
  #include "mozilla/StaticPrefs_widget.h"
 +#include "mozilla/StaticPrefs_zen.h"
++#include "mozilla/nsZenDragAndDrop.h"
  #include "mozilla/WritingModes.h"
  #include "mozilla/dom/Document.h"
  #include "mozilla/layers/CompositorBridgeChild.h"
-@@ -1332,6 +1333,110 @@ - (NSRect)_opaqueRectForWindowMoveWhenInTitlebar {
+@@ -1332,6 +1334,110 @@ - (NSRect)_opaqueRectForWindowMoveWhenInTitlebar {
  }
  @end
  
@@ -121,7 +122,28 @@ index 2efd02e4a92433fd29bbfdb707aa81cfec45031e..3b763c3927f07e529c826f8e4f62bc80
  void nsCocoaWindow::UpdateWindowDraggingRegion(
      const LayoutDeviceIntRegion& aRegion) {
    // mChildView returns YES from mouseDownCanMoveWindow, so we need to put
-@@ -4919,6 +5024,10 @@ - (BOOL)wantsBestResolutionOpenGLSurface {
+@@ -3858,7 +3964,9 @@ - (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender {
+ // NSDraggingDestination
+ - (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender {
+   MOZ_LOG(sCocoaLog, LogLevel::Info, ("ChildView draggingUpdated: entered\n"));
+-  return [self doDragAction:eDragOver sender:sender];
++  NSDragOperation operation = [self doDragAction:eDragOver sender:sender];
++  zen::PrepareDropLanding(sender);
++  return operation;
+ }
+ 
+ // NSDraggingDestination
+@@ -3874,6 +3982,9 @@ - (void)draggingExited:(id<NSDraggingInfo>)sender {
+ - (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
+   nsAutoRetainCocoaObject kungFuDeathGrip(self);
+   BOOL handled = [self doDragAction:eDrop sender:sender] != NSDragOperationNone;
++  if (handled) {
++    zen::LandDrop(sender);
++  }
+   NS_IF_RELEASE(mDragService);
+   return handled;
+ }
+@@ -4919,6 +5030,10 @@ - (BOOL)wantsBestResolutionOpenGLSurface {
  nsCocoaWindow::~nsCocoaWindow() {
    NS_OBJC_BEGIN_TRY_IGNORE_BLOCK;
  

src/widget/cocoa/nsDragService-mm.patch

@@ -1,5 +1,5 @@
 diff --git a/widget/cocoa/nsDragService.mm b/widget/cocoa/nsDragService.mm
-index 340a9ad81c5cb23bb7e5f927d11d5cffdde7ce70..32fc707ccfa56fa8c307860868d092c4a9050419 100644
+index 340a9ad81c5cb23bb7e5f927d11d5cffdde7ce70..ba597ba4373ba3ace7455ce0859f2339349ffc06 100644
 --- a/widget/cocoa/nsDragService.mm
 +++ b/widget/cocoa/nsDragService.mm
 @@ -10,6 +10,7 @@
@@ -45,3 +45,112 @@ index 340a9ad81c5cb23bb7e5f927d11d5cffdde7ce70..32fc707ccfa56fa8c307860868d092c4
  #endif
        src += 4;
        dest += 4;
+@@ -249,12 +254,44 @@
+       [[[NSDraggingItem alloc] initWithPasteboardWriter:pbItem] autorelease];
+   [dragItem setDraggingFrame:localDragRect contents:image];
+ 
++  NSMutableArray* dragItems = [NSMutableArray arrayWithObject:dragItem];
++  auto zenDragAndDrop = zen::nsZenDragAndDrop::GetZenDragAndDropInstance();
++  const nsTArray<nsCOMPtr<nsINode>> noExtraImages;
++  @try {
++    for (const auto& extraImageNode :
++         zenDragAndDrop ? zenDragAndDrop->DragImages() : noExtraImages) {
++      nsCOMPtr<nsINode> mainImage = std::move(mImage);
++      mImage = extraImageNode;
++      NSPoint extraPoint;
++      NSImage* extraImage = ConstructDragImage(mSourceNode, aRegion, &extraPoint);
++      mImage = std::move(mainImage);
++      if (!extraImage) {
++        continue;
++      }
++      NSRect extraRect = extraImage.alignmentRect;
++      extraRect.origin.x = extraPoint.x;
++      extraRect.origin.y = extraPoint.y - extraRect.size.height;
++      NSPasteboardItem* extraPbItem = [[NSPasteboardItem new] autorelease];
++      [extraPbItem setData:[NSData data]
++                   forType:[UTIHelper stringFromPboardType:kMozWildcardPboardType]];
++      NSDraggingItem* extraItem = [[[NSDraggingItem alloc]
++          initWithPasteboardWriter:extraPbItem] autorelease];
++      [extraItem setDraggingFrame:extraRect contents:extraImage];
++      [dragItems addObject:extraItem];
++    }
++  } @catch (NSException* e) {
++    dragItems = [NSMutableArray arrayWithObject:dragItem];
++  }
++
+   OpenDragPopup();
+ 
+   mNSDraggingSession = [mNativeDragView
+-      beginDraggingSessionWithItems:[NSArray arrayWithObject:dragItem]
++      beginDraggingSessionWithItems:dragItems
+                               event:mNativeDragEvent
+                              source:mNativeDragView];
++  if (dragItems.count > 1) {
++    mNSDraggingSession.draggingFormation = NSDraggingFormationStack;
++  }
+ 
+   mNSDraggingSession.animatesToStartingPositionsOnCancelOrFail =
+       !mDataTransfer || mDataTransfer->MozShowFailAnimation();
+@@ -455,29 +492,44 @@
+     }
+ 
+     if (pc) {
++      nsPoint pt = LayoutDevicePixel::ToAppUnits(
++          devPoint, pc->DeviceContext()->AppUnitsPerDevPixel());
++      CSSIntPoint screenPoint =
++          CSSIntPoint(nsPresContext::AppUnitsToIntCSSPixels(pt.x),
++                      nsPresContext::AppUnitsToIntCSSPixels(pt.y));
++
++      NSMutableArray* images = [NSMutableArray array];
++      NSMutableArray* rects = [NSMutableArray array];
++      auto render = [&]() {
++        LayoutDeviceIntRect newRect;
++        NSImage* image =
++            ConstructDragImage(mSourceNode, Nothing(), screenPoint, &newRect);
++        [images addObject:image ? (id)image : (id)[NSNull null]];
++        [rects addObject:[NSValue valueWithRect:
++                                      image ? nsCocoaUtils::GeckoRectToCocoaRectDevPix(
++                                                  newRect, scaleFactor)
++                                            : NSZeroRect]];
++      };
++      render();
++      if (auto zenDragAndDrop = zen::nsZenDragAndDrop::GetZenDragAndDropInstance()) {
++        for (const auto& extraImageNode : zenDragAndDrop->DragImages()) {
++          nsCOMPtr<nsINode> mainImage = std::move(mImage);
++          mImage = extraImageNode;
++          render();
++          mImage = std::move(mainImage);
++        }
++      }
++
+       void (^changeImageBlock)(NSDraggingItem*, NSInteger, BOOL*) = ^(
+           NSDraggingItem* draggingItem, NSInteger idx, BOOL* stop) {
+-        // We never add more than one item right now, but check just in case.
+-        if (idx > 0) {
++        if ((NSUInteger)idx >= images.count || images[idx] == [NSNull null]) {
+           return;
+         }
+-
+-        nsPoint pt = LayoutDevicePixel::ToAppUnits(
+-            devPoint, pc->DeviceContext()->AppUnitsPerDevPixel());
+-        CSSIntPoint screenPoint =
+-            CSSIntPoint(nsPresContext::AppUnitsToIntCSSPixels(pt.x),
+-                        nsPresContext::AppUnitsToIntCSSPixels(pt.y));
+-
+-        // Create a new image; if one isn't returned don't change the current
+-        // one.
+-        LayoutDeviceIntRect newRect;
+-        NSImage* image =
+-            ConstructDragImage(mSourceNode, Nothing(), screenPoint, &newRect);
+-        if (image) {
+-          NSRect draggingRect =
+-              nsCocoaUtils::GeckoRectToCocoaRectDevPix(newRect, scaleFactor);
+-          [draggingItem setDraggingFrame:draggingRect contents:image];
++        NSRect frame = [rects[idx] rectValue];
++        if (idx > 0) {
++          frame.origin = draggingItem.draggingFrame.origin;
+         }
++        [draggingItem setDraggingFrame:frame contents:images[idx]];
+       };
+ 
+       [mNSDraggingSession

src/widget/gtk/nsDragSessionSource-cpp.patch

@@ -1,16 +1,16 @@
-diff --git a/widget/gtk/nsDragService.cpp b/widget/gtk/nsDragService.cpp
-index f760a6bb887b321376761431886c771f14fd03af..d52110ba52a95ef7c7bfb915e120b8dd636c9448 100644
---- a/widget/gtk/nsDragService.cpp
-+++ b/widget/gtk/nsDragService.cpp
-@@ -23,6 +23,7 @@
+diff --git a/widget/gtk/nsDragSessionSource.cpp b/widget/gtk/nsDragSessionSource.cpp
+index a5f67d700f8c80d513f08cc25405b57cf28a2a9a..58186470bcbb7b1eda34ee20a19e29d540ab052a 100644
+--- a/widget/gtk/nsDragSessionSource.cpp
++++ b/widget/gtk/nsDragSessionSource.cpp
+@@ -13,6 +13,7 @@
+ #include "mozilla/Services.h"
  #include "mozilla/StaticPrefs_widget.h"
- #include "mozilla/WidgetUtils.h"
  #include "mozilla/WidgetUtilsGtk.h"
 +#include "mozilla/nsZenDragAndDrop.h"
  #include "nsAppShell.h"
  #include "nsArrayUtils.h"
  #include "nsCRT.h"
-@@ -2304,11 +2305,15 @@ bool nsDragSession::SetAlphaPixmap(SourceSurface* aSurface,
+@@ -1196,11 +1197,15 @@ bool nsDragSessionSource::SetAlphaPixmap(SourceSurface* aSurface,
        cairo_image_surface_get_stride(surf), SurfaceFormat::B8G8R8A8);
    if (!dt) return false;
  

src/zen/boosts/ZenBoostsEditor.mjs

@@ -69,7 +69,9 @@ export class nsZenBoostEditor {
    * @returns {ZenBoostsParent} Boost JSActor parent
    */
   get zenBoostsParent() {
-    const linkedBrowser = this.openerWindow.gBrowser.selectedTab.linkedBrowser;
+    const linkedBrowser =
+      this.editorWindow.browser ??
+      this.openerWindow.gBrowser.selectedTab.linkedBrowser;
     const actor =
       linkedBrowser.browsingContext.currentWindowGlobal.getActor("ZenBoosts");
     return actor;
@@ -1521,7 +1523,7 @@ ${cssSelector} {
   shuffleBoost() {
     const availFonts = this.fetchFontList();
     const commonFonts = this.commonFonts;
-    let font = commonFonts[Math.round(Math.random() * commonFonts.length)];
+    let font = commonFonts[Math.floor(Math.random() * commonFonts.length)];
     if (availFonts.includes(font)) {
       this.currentBoostData.fontFamily = font;
     }