Lightweight, transparent, and modern Firefox UI compatible with Firefox 143+ on macOS, Linux & Windows

• Windows 11 transparency (Mica & Acrylic)
• Optional macOS-style toolbar layout
• Lightweight, distraction-free, and fast
• Stripped fork for clean performance

1. Download the theme ZIP
2. Open Firefox → about:support → click Open Folder next to your profile
3. Copy the chrome folder and user.js file into your profile directory
4. Close Firefox completely and restart

Tip: Install Zen Internet to enable transparency on all websites.

Set to true:

• toolkit.legacyUserProfileCustomizations.stylesheets
• svg.context-properties.content.enabled
• Windows: widget.windows.mica
• Windows: widget.windows.mica.toplevel-backdrop = 2

Set to false:

• sidebar.animation.enabled
• macOS: widget.macos.native-context-menus (optional)

Optional macOS-style layout:

• gwfox.plus = true

Restart Firefox after changing configuration values.

• widget.windows.mica.popups = 1 or 2
• browser.tabs.allow_transparent_browser (may affect websites)

• macOS-style toolbar & compact mode: gwfox.plus = true
• System-style window controls: gwfox.plus_sc = true
• Bookmark toolbar at top: gwfox.plus_tb = true
• Remove window border with horizontal tabs: gwfox.noborder = true
• Adaptive Tab Bar Colour: gwfox.atbc = true (Add-on)
• Blur effects (GNOME): gwfox.bms = true (Blur my Shell)

Forked and modified from GWFOX.