Installation

1. Move the theme files into [your-profile]/chrome/.
2. Configure about:config with these preferences:

Preference	Value	Platform / Notes
toolkit.legacyUserProfileCustomizations.stylesheets	true	Required
svg.context-properties.content.enabled	true	Required
widget.windows.mica	true	Windows¹
widget.windows.mica.toplevel-backdrop	2	Windows
widget.gtk.rounded-bottom-corners.enabled	true	Linux
widget.macos.native-context-menus	false	macOS
sidebar.animation.enabled	false	Required

¹ Windows: Requires enabling "System theme — auto" in Firefox Add-ons manager.

Important

For East Asian (CJK) input: Must enable "Address Bar: show results during IME composition" in Settings > Firefox Labs.

3. Restart Firefox to apply changes.

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Customization

Create these preferences in about:config to modify the UI:

Boolean Toggle

Preference	Description	Notes
gwfox.icons	Enable menu icons
gwfox.blur	Enable UI blur effects	Disable if performance issues occur
gwfox.toolbar	Auto-hide bookmarks toolbar
gwfox.bms	Enable transparency	Linux only
gwfox.urlbar	Move address bar to sidebar
gwfox.newtab	Enable New Tab transparency	Requires allow_transparent_browser
gwfox.noborder	Remove window borders
gwfox.atbc	Enable ATBC compatibility	For Adaptive Tab Bar Colour
gwfox.db	Disable menu blur
gwfox.ac	Enable accent color	Edit --bg0 in CSS to customize
gwfox.plus	Enable bundled layout
gwfox.plus_sc	Use native window controls

Numerical Settings

Preference	Description	Values
gwfox.sidebar	Set sidebar width	1, 2, or 3