This theme is compatible with Firefox 145+ on macOS and Windows

1. Download the theme and move the chrome folder into your Firefox profile directory.
2. Navigate to about:config and configure the following preferences:
   • Set to true:
     • toolkit.legacyUserProfileCustomizations.stylesheets
     • svg.context-properties.content.enabled
     • widget.windows.mica (Windows; requires System theme — auto to work)
   • Set to false:
     • sidebar.animation.enabled
     • widget.macos.native-context-menus (macOS)
   • Set to 2:
     • widget.windows.mica.toplevel-backdrop (Windows)
3. Restart Firefox.

To enable additional features, add these Boolean preferences in about:config and set them to true:

• gwfox.plus: Enables a bundled layout featuring macOS-style window controls, compact mode, a sidebar-integrated address bar, and an auto-hide Bookmarks Toolbar at the bottom (shows on hover).
  • gwfox.plus_sc: Use native window controls.
  • gwfox.plus_tb: Auto-hide Bookmarks Toolbar at the top instead.
• gwfox.atbc: Enable compatibility with the Adaptive Tab Bar Colour extension.
• gwfox.noborder: Remove window borders.
• gwfox.icons: Enable menu icons.

1. In about:config, add a new Boolean preference named gwfox.ac and set it to true.
2. Locate the --bg0 variable in userChrome.css and userContent.css, and change its value to your preferred color.