Smooth Scrolling Profiles for High-Refresh Displays

[penguin22]

Summary
Add two user-selectable scroll profiles in Settings → General → Browsing → Smooth Scrolling:

1. Smooth Scrolling (Default)
2. Smooth Scrolling (High-Refresh Display)

Optionally include an in-UI “Test Smooth Scrolling” pane for instant preview.

Current Defaults (Smooth Scrolling = On): New Name: Smooth Scrolling (Default)

• layout.frame_rate = –1
• apz.asyncscroll.throttling.enabled = true
• general.smoothScroll.mouseWheel.durationMinMS ≈ 200
• general.smoothScroll.mouseWheel.durationMaxMS ≈ 300
• gfx.webrender.all = (auto)
• layers.acceleration.force-enabled = (auto)

Profile 2: Smooth Scrolling (High-Refresh Display)
Designed for 120 Hz+ panels

• layout.frame_rate → 0
• apz.asyncscroll.throttling.enabled → false
• general.smoothScroll.mouseWheel.durationMinMS → 100
• general.smoothScroll.mouseWheel.durationMaxMS → 400
• gfx.webrender.all → true
• layers.acceleration.force-enabled → true

Optional: Built-In Scroll Test

Add a “Preview Smooth Scrolling” section that renders a quick requestAnimationFrame scroll demo at the selected profile settings. This lets users verify smoothness on their own hardware before closing Settings.

[Jon]

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