diff --git a/.gitignore b/.gitignore
index 67b3b7ef6..50ad94e54 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,4 @@ build/signing/cert.pem
 build/signing/private_key.pem
 build/signing/private_key.p12
 
+bloat-dump.log
diff --git a/package.json b/package.json
index 705e3e515..0ebf49c20 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "build": "surfer build",
     "build:ui": "surfer build --ui",
     "start": "cd engine && python3 ./mach run --noprofile",
+    "start:bloat": "XPCOM_MEM_BLOAT_LOG=1 npm start",
     "import": "npm run ffprefs && npm run import:dumps && surfer import",
     "import:dumps": "python3 scripts/update_service_dumps.py",
     "export": "surfer export",
diff --git a/src/zen/boosts/nsZenBoostsBackend.cpp b/src/zen/boosts/nsZenBoostsBackend.cpp
index a702f5c78..1968c6ad1 100644
--- a/src/zen/boosts/nsZenBoostsBackend.cpp
+++ b/src/zen/boosts/nsZenBoostsBackend.cpp
@@ -46,6 +46,8 @@
 
 namespace zen {
 
+NS_IMPL_ISUPPORTS0(nsZenBoostsBackend)
+
 nsZenAccentOklab nsZenBoostsBackend::mCachedAccent{0};
 nsZenAccentOklab nsZenBoostsBackend::mCachedComplementary{0};
 float nsZenBoostsBackend::mCachedComplementaryRotationDeg = 0.0f;
@@ -345,7 +347,7 @@ inline static void GetZenBoostsDataFromBrowsingContext(
 
 }  // namespace
 
-static mozilla::StaticAutoPtr<nsZenBoostsBackend> sZenBoostsBackend;
+static mozilla::StaticRefPtr<nsZenBoostsBackend> sZenBoostsBackend;
 
 auto nsZenBoostsBackend::GetInstance() -> nsZenBoostsBackend* {
   if (!XRE_IsContentProcess()) {
diff --git a/src/zen/boosts/nsZenBoostsBackend.h b/src/zen/boosts/nsZenBoostsBackend.h
index 4d7bcfe10..67f3af6e8 100644
--- a/src/zen/boosts/nsZenBoostsBackend.h
+++ b/src/zen/boosts/nsZenBoostsBackend.h
@@ -6,6 +6,7 @@
 #define mozilla_ZenBoostsBackend_h_
 
 #include "nsColor.h"
+#include "nsISupportsImpl.h"
 #include "nsPresContext.h"
 
 #include "mozilla/RefPtr.h"
@@ -22,10 +23,11 @@ struct nsZenAccentOklab {
   float contrastFactor;
 };
 
-class nsZenBoostsBackend final {
+class nsZenBoostsBackend final : public nsISupports {
  public:
+  NS_DECL_ISUPPORTS
+
   explicit nsZenBoostsBackend() = default;
-  ~nsZenBoostsBackend() = default;
 
   /**
    * Indicates whether the current frame being rendered is for anonymous
@@ -90,6 +92,8 @@ class nsZenBoostsBackend final {
   bool mCachedCurrentInverted = false;
 
  private:
+  ~nsZenBoostsBackend() = default;
+
   /**
    * The presshell of the current document being rendered.
    */
diff --git a/src/zen/common/modules/ZenMenubar.mjs b/src/zen/common/modules/ZenMenubar.mjs
index 08ce51e81..b6c5144d7 100644
--- a/src/zen/common/modules/ZenMenubar.mjs
+++ b/src/zen/common/modules/ZenMenubar.mjs
@@ -50,7 +50,8 @@ export class nsZenMenuBar {
 
     const sibling = document.getElementById("viewSidebarMenuMenu");
     const togglePinnedItem = window.MozXULElement.parseXULToFragment(
-      '<menuitem data-l10n-id="zen-menubar-toggle-pinned-tabs" />'
+      '<menuitem data-l10n-id="zen-menubar-toggle-pinned-tabs"' +
+        ' data-l10n-args="{&quot;pinnedAreCollapsed&quot;:&quot;&quot;}" />'
     ).querySelector("menuitem");
     if (!gZenWorkspaces.privateWindowOrDisabled) {
       sibling.after(togglePinnedItem);
diff --git a/src/zen/common/modules/ZenUIManager.mjs b/src/zen/common/modules/ZenUIManager.mjs
index 84fe3271b..67e26a3be 100644
--- a/src/zen/common/modules/ZenUIManager.mjs
+++ b/src/zen/common/modules/ZenUIManager.mjs
@@ -257,7 +257,7 @@ window.gZenUIManager = {
   },
 
   updateTabsToolbar() {
-    const kUrlbarHeight = 335;
+    const kUrlbarHeight = 333;
     gURLBar.style.setProperty(
       "--zen-urlbar-top",
       `${window.innerHeight / 2 - Math.max(kUrlbarHeight, window.windowUtils.getBoundsWithoutFlushing(gURLBar).height) / 2}px`
diff --git a/src/zen/common/styles/zen-browser-ui.css b/src/zen/common/styles/zen-browser-ui.css
index 42e2afe15..992a9ac13 100644
--- a/src/zen/common/styles/zen-browser-ui.css
+++ b/src/zen/common/styles/zen-browser-ui.css
@@ -107,6 +107,11 @@ body,
   }
 }
 
+:root[swipe-gesture] #tabbrowser-arrowscrollbox {
+  /* See gh-13703 for rationale. */
+  pointer-events: none;
+}
+
 #zen-browser-background {
   /* This is conceptually a background, but putting this on a pseudo-element
     * avoids it from suppressing the chrome-content separator border, etc.
diff --git a/src/zen/common/styles/zen-omnibox.css b/src/zen/common/styles/zen-omnibox.css
index f69e27c32..e4517d344 100644
--- a/src/zen/common/styles/zen-omnibox.css
+++ b/src/zen/common/styles/zen-omnibox.css
@@ -17,9 +17,8 @@
 }
 
 .urlbar {
-  --urlbarView-separator-color: light-dark(hsl(0, 0%, 80%), hsl(0, 0%, 20%));
-  --urlbarView-hover-background: var(--toolbarbutton-hover-background);
-  --urlbarView-highlight-background: var(--toolbarbutton-hover-background);
+  --urlbarview-separator-color: light-dark(hsl(0, 0%, 80%), hsl(0, 0%, 20%));
+  --urlbarview-background-color-hover: var(--toolbarbutton-hover-background);
   border-radius: calc(var(--toolbarbutton-border-radius) - 2px);
   height: var(--urlbar-height);
   --urlbarView-results-padding: 10px !important;
@@ -682,7 +681,7 @@
 }
 
 #urlbar-results {
-  max-height: 260px;
+  max-height: 252px;
   overflow-y: auto;
   scrollbar-width: none;
   margin-block-start: calc(var(--urlbarView-results-padding) - 2px);
diff --git a/src/zen/folders/zen-folders.css b/src/zen/folders/zen-folders.css
index 146e94364..f3ba4cdfd 100644
--- a/src/zen/folders/zen-folders.css
+++ b/src/zen/folders/zen-folders.css
@@ -224,7 +224,7 @@ zen-folder[collapsed] > .tab-group-container {
 
 /* Tabs popup */
 #zen-folder-tabs-popup {
-  --arrowpanel-padding: 0;
+  --panel-padding: 0;
   width: 250px;
 
   & #zen-folder-tabs-search-no-results {
diff --git a/src/zen/mods/ZenStyleSheetCache.cpp b/src/zen/mods/ZenStyleSheetCache.cpp
index dccfbd4b6..aeb723e00 100644
--- a/src/zen/mods/ZenStyleSheetCache.cpp
+++ b/src/zen/mods/ZenStyleSheetCache.cpp
@@ -11,6 +11,7 @@
 
 #include "nsStyleSheetService.h"
 
+#include "mozilla/ClearOnShutdown.h"
 #include "mozilla/css/SheetParsingMode.h"
 #include "mozilla/GlobalStyleSheetCache.h"
 #include "mozilla/RefPtr.h"
@@ -72,6 +73,7 @@ auto ZenStyleSheetCache::Singleton() -> ZenStyleSheetCache* {
   MOZ_ASSERT(NS_IsMainThread());
   if (!gZenModsCache) {
     gZenModsCache = new ZenStyleSheetCache;
+    ClearOnShutdown(&gZenModsCache);
   }
   return gZenModsCache;
 }
diff --git a/src/zen/spaces/zen-workspaces.css b/src/zen/spaces/zen-workspaces.css
index 3cfda3ccb..97c0d89be 100644
--- a/src/zen/spaces/zen-workspaces.css
+++ b/src/zen/spaces/zen-workspaces.css
@@ -346,12 +346,8 @@ zen-workspace {
       overflow-y: auto;
     }
 
-    :root[swipe-gesture] &{
-      pointer-events: none;
-
-      &::part(scrollbox) {
-        scrollbar-width: none;
-      }
+    :root[swipe-gesture] &::part(scrollbox) {
+      scrollbar-width: none;
     }
 
     &[overflowing] {
diff --git a/src/zen/tabs/ZenPinnedTabManager.mjs b/src/zen/tabs/ZenPinnedTabManager.mjs
index 893c89bb3..55bd8280c 100644
--- a/src/zen/tabs/ZenPinnedTabManager.mjs
+++ b/src/zen/tabs/ZenPinnedTabManager.mjs
@@ -547,10 +547,12 @@ class nsZenPinnedTabManager extends nsZenDOMOperatedFeature {
             <menuseparator id="context_zen-pinned-tab-separator" hidden="true"/>
             <menuitem id="context_zen-replace-pinned-url-with-current"
                       data-lazy-l10n-id="tab-context-zen-replace-pinned-url-with-current"
+                      data-l10n-args="{&quot;isEssential&quot;:&quot;&quot;}"
                       hidden="true"
                       command="cmd_zenReplacePinnedUrlWithCurrent"/>
             <menuitem id="context_zen-reset-pinned-tab"
                       data-lazy-l10n-id="tab-context-zen-reset-pinned-tab"
+                      data-l10n-args="{&quot;isEssential&quot;:&quot;&quot;}"
                       hidden="true"
                       command="cmd_zenPinnedTabResetNoTab"/>
         `);