From fdf9588b7b1ed58d71254d8ee1a1c8b414728be5 Mon Sep 17 00:00:00 2001
From: "mr. m" <91018726+mr-cheffy@users.noreply.github.com>
Date: Wed, 9 Sep 2026 02:13:38 +0200
Subject: [PATCH] gh-15026: Improve scrolling performance (gh-15306)

---
 prefs/README.md                           |  2 +-
 prefs/fastfox/smoothscroll.yaml           | 49 -----------------------
 src/zen/common/sys/ZenUIMigration.sys.mjs | 14 ++++++-
 3 files changed, 14 insertions(+), 51 deletions(-)
 delete mode 100644 prefs/fastfox/smoothscroll.yaml

diff --git a/prefs/README.md b/prefs/README.md
index 6d1ef9d47..a03f7aaf5 100644
--- a/prefs/README.md
+++ b/prefs/README.md
@@ -4,4 +4,4 @@ This directory contains configuration files for Zen. They are divided by folder
 
 - `firefox/`: Preferences to override Firefox defaults.
 - `zen/`: Preferences to configure Zen-specific features.
-- `privatefox/` & `fastfox/`: _Some_ of the preferences got extracted from [Betterfox](https://github.com/yokoffing/Betterfox).
+- `privatefox/`: _Some_ of the preferences got extracted from [Betterfox](https://github.com/yokoffing/Betterfox).
diff --git a/prefs/fastfox/smoothscroll.yaml b/prefs/fastfox/smoothscroll.yaml
deleted file mode 100644
index 943c097a4..000000000
--- a/prefs/fastfox/smoothscroll.yaml
+++ /dev/null
@@ -1,49 +0,0 @@
-# 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/.
-
-# Smooth scrolling and mousewheel tuning preferences
-
-- name: general.smoothScroll.msdPhysics.enabled
-  condition: "!defined(XP_MACOSX)"
-  value: true
-
-- name: general.smoothScroll.currentVelocityWeighting
-  condition: "!defined(XP_MACOSX)"
-  value: "0.15"
-
-- name: general.smoothScroll.stopDecelerationWeighting
-  condition: "!defined(XP_MACOSX)"
-  value: "0.6"
-
-- name: mousewheel.min_line_scroll_amount
-  condition: "!defined(XP_MACOSX)"
-  value: 10
-
-- name: general.smoothScroll.mouseWheel.durationMinMS
-  condition: "!defined(XP_MACOSX)"
-  value: 80
-
-- name: general.smoothScroll.msdPhysics.continuousMotionMaxDeltaMS
-  condition: "!defined(XP_MACOSX)"
-  value: 12
-
-- name: general.smoothScroll.msdPhysics.motionBeginSpringConstant
-  condition: "!defined(XP_MACOSX)"
-  value: 600
-
-- name: general.smoothScroll.msdPhysics.regularSpringConstant
-  condition: "!defined(XP_MACOSX)"
-  value: 650
-
-- name: general.smoothScroll.msdPhysics.slowdownMinDeltaMS
-  condition: "!defined(XP_MACOSX)"
-  value: 25
-
-- name: general.smoothScroll.msdPhysics.slowdownSpringConstant
-  condition: "!defined(XP_MACOSX)"
-  value: 250
-
-- name: mousewheel.default.delta_multiplier_y
-  condition: "!defined(XP_MACOSX)"
-  value: 200
diff --git a/src/zen/common/sys/ZenUIMigration.sys.mjs b/src/zen/common/sys/ZenUIMigration.sys.mjs
index fd6bbe4f0..39ac96d47 100644
--- a/src/zen/common/sys/ZenUIMigration.sys.mjs
+++ b/src/zen/common/sys/ZenUIMigration.sys.mjs
@@ -12,7 +12,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
 
 class nsZenUIMigration {
   PREF_NAME = "zen.ui.migration.version";
-  MIGRATION_VERSION = 7;
+  MIGRATION_VERSION = 8;
 
   init(isNewProfile) {
     if (!isNewProfile) {
@@ -164,6 +164,18 @@ class nsZenUIMigration {
       Services.prefs.setBoolPref("zen.widget.macos.window-vibrancy", false);
     }
   }
+
+  _migrateV8() {
+    // A version mismatch in the downloadable gfx blocklist wrongly blocked
+    // video overlays for every Windows user. The status pref persists in the
+    // profile and short-circuits the blocklist evaluation, so clear it (and
+    // its failure id) and restart, since gfx is already initialized by now.
+    if (Services.prefs.prefHasUserValue("gfx.blacklist.video-overlay")) {
+      Services.prefs.clearUserPref("gfx.blacklist.video-overlay");
+      Services.prefs.clearUserPref("gfx.blacklist.video-overlay.failureid");
+      this.shouldRestart = true;
+    }
+  }
 }
 
 export var gZenUIMigration = new nsZenUIMigration();