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A Firefox userChrome.css theme that aims to recreate the look and feel of the Chromium version of Microsoft Edge.
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README.md

Edge-Frfox

A Firefox userChrome.css theme that aims to recreate the look and feel of the Chromium version of Microsoft Edge.

thumbnail screenshot

How to install

  1. Go to about:support and click the "Open Folder/Show in Finder" button for the root directory of your browser profile/s.

  2. Download and copy the chrome folder into the profile folder.

  3. Go to about:config and change these preferences:

    For all operating systems:

    • toolkit.legacyUserProfileCustomizations.stylesheets = true
    • svg.context-properties.content.enabled = true
    • layout.css.color-mix.enabled = true

    Firefox 119.0 and above:

    • layout.css.light-dark.enabled = true

    On macOS:

    • To use the Edge style context menu on macOS then set widget.macos.native-context-menus = false

    Recommended:

    • browser.tabs.tabMinWidth = 66
    • browser.tabs.tabClipWidth = 86

    Optional:

    • To use the light theme in private browsing mode set browser.theme.dark-private-windows = false

    Additional tweaks can also be applied to the theme, such as Floating Tabs, rounded browser corners and more. See Tweaks.

Note: Most frequently tested on macOS

Screenshots

Theme Light Dark
Default (Windows 11) Light Dark
Floating Tabs (Windows 11) Light, Floating Tabs Dark, Floating Tabs
GTK (GNOME 42, adw-gtk3 theme) Light, GTK Dark, GTK

Tweaks

Certain tweaks can be applied to the theme, to enable them navigate to about:config and create a boolean key for each tweak you want to use and set it to true, then restart the browser.

To disable a tweak, set the key to false or delete it, then restart the browser.

Enable Edge style floating tabs
uc.tweak.floating-tabs
OPTIONAL1: Make the top and bottom margins of the tab equal
uc.tweak.floating-tabs.equal-margin
Enable rounded corners
uc.tweak.rounded-corners
Use background image on newtab page
SETUP: Add an image named background-0.(jpg/png) to the chrome folder.
OPTIONAL: Add a second image named background-1.(jpg/png) for seperate dark mode background.
uc.tweak.newtab-background
Hide Firefox logo on newtab page
uc.tweak.hide-newtab-logo
Disable drag space above tabs
uc.tweak.disable-drag-space
Force tab background colour to the same colour as the navbar background (useful for Proton themes)
NOTE: can cause readability issues with some themes! (eg. white text on white bg)
uc.tweak.force-tab-colour
force tab colour example (Left: OFF, Right: ON)
Show context menu navigation buttons (Back, Forward, Reload, Bookmark) vertically
NOTE: labels are only shown in the English language.
uc.tweak.vertical-context-navigation
Remove tab separators
uc.tweak.remove-tab-separators
Use Firefox's default context menu font-size (only applies to Windows)
uc.tweak.smaller-context-menu-text
Disable custom context menus
uc.tweak.revert-context-menu
If a tab's close button is hidden, show it when hovering over tab
uc.tweak.show-tab-close-button-on-hover

Mica Tweak Notice

Mica is broken due to changes made in the Firefox 115 update, Mica has now been removed from this theme.

If you still have uc.tweak.win11-mica set in about:config you can safely delete it

Acknowledgements

muckSponge - MaterialFox

Microsoft - Fluent UI System Icons

KibSquib48 - MicaFox