Edge-Frfox

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

Screenshot: macOS / Firefox 120 / Tweaks: rounded corners, hide forward button.

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.

2. Download the repository and extract the files.

3. From the repository folder, copy the chrome folder and user.js file into your Firefox profile folder.

4. Close and restart Firefox, if performed correctly, the theme should now be installed.

5. Optionally, listed below are some additional Firefox settings that can be changed using about:config:

   Description	Preference Name	Value
   Use Edge-themed context menu on macOS	widget.macos.native-context-menus	false
   Use light theme in private browsing mode	browser.theme.dark-private-windows	false
   Use rounded bottom window corners on Linux	widget.gtk.rounded-bottom-corners.enabled	true
   Use Windows accent colour in tabs toolbar (must use Windows 'show accent colour in title bar' option)	browser.theme.windows.accent-color-in-tabs.enabled	true

   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)
Floating Tabs + Rounded Corners (Windows 11)
Hide Tabs Bar + Rounded Corners + Sidebery theme (macOS)
Rounded Corners (Linux, Ubuntu Yaru theme)

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.

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

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Floating/rounded tabs

Emulate the look of the rounded tabs feature available in Edge.

uc.tweak.floating-tabs

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Rounded browser corners

Add padding and rounded corners around the browser window, as seen in the newest redesign of Edge.

uc.tweak.rounded-corners

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Hide tabs toolbar

This hides the tabs toolbar when using a vertical tabs extension such as Sidebery, Tree Style Tab or Tab Center Reborn.

uc.tweak.hide-tabs-bar

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Sidebery Theme

Enables the Sidebery extension sidebar theme, can be used with or without the hide tabs toolbar tweak. For a preview of the Sidebery theme, see the macOS screenshot in the Screenshots section.

Setup

Download and install Sidebery from the Firefox addons store.

On Linux the colour theme may not work properly. To fix this, you can enable the "auto: dark/light" colour scheme option inside Sidebery (though this will disable the custom Firefox theme colours, and only use system light/dark colours).

To open the Sidebery settings page, find its icon in the toolbar or in the extensions menu, then right-click it and select 'Open settings'.

Recommended settings

• Context menu:
  • Use native context menu: 'on'
• Navigation bar:
  • layout: 'horizontal' or 'hidden'
  • Bottom bar of tabs panel:
    • Recently closed tabs: 'off'
    • Bookmarks: 'off'
    • History: 'off'
• Tabs:
  • Show new tab buttons: 'on' or 'off'
  • New tab buttons:
    • position: 'after tabs'
  • Position of new tab:
    • Place new tab opened from another tab: 'do not move it'
• Pinned tabs:
  • Pinned tabs position: 'in panel - top'
  • Show titles of pinned tabs: 'on' or 'off'
• Appearance:
  • Theme: 'proton'
  • Color scheme: 'firefox'

Alternatively, you can import the provided sidebery.json configuration file, but this will restore Sidebery to the default settings before applying it.

uc.tweak.theme.sidebery

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Remove extra space at the top of the window

Removes the additional space at the top of the window above the tabs that appears when the window is not maximised. Enabling this will cause the tabs to touch the top edge of the window at all times.

uc.tweak.disable-drag-space

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New tab page background image

Adds a custom background image to the new tab page.

Required setup:

• In your chrome folder, add an image with a filename of background-0.(jpg/png).
• Optionally, add a second image named background-1.(jpg/png) this will be selected when the dark theme is enabled.

uc.tweak.newtab-background

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Hide forward button

Hides the forward button when it is not needed, as seen in Edge.

uc.tweak.hide-forward-button

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Hide Firefox logo on New tab page

Hide the Firefox logo + wordmark when on the new tab page.

uc.tweak.hide-newtab-logo

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Force tab colour to match the toolbar colour

Removes the ability for custom themes to change the colour of the selected tabs, instead forcing them to match the toolbar colour. This can be useful when using themes designed for the Firefox's default Proton style.

(Left: OFF, Right: ON)

uc.tweak.force-tab-colour

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Show context menu navigation buttons vertically

Displays the navigation buttons (Back, Forward, Reload, Bookmark) in the right-click menu vertically like all the other menu items.

uc.tweak.vertical-context-navigation

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Hide access keys in context menu

Removes the underlining or highlighting of certain characters in the context menu. These underlines correspond to the key that when pressed, activates the item.

For example, "Undo" becomes "Undo" and "Inspect (Q)" becomes "Inspect".

uc.tweak.context-menu.hide-access-key

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Remove separators between tabs

Removes the vertical separating lines between the tabs, resulting in a cleaner look.

uc.tweak.remove-tab-separators

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Always show tab close buttons when hovering over them

When the tabs become too small, Firefox will hide the close buttons for non-active tabs to save space. This tweak will always display the close buttons when hovering over a tab.

uc.tweak.show-tab-close-button-on-hover

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Use Firefox's default context menu font-size

This reverts the custom font-size set on the context menu, only applies to Windows users.

uc.tweak.smaller-context-menu-text

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Disable custom context menu

Disable the custom Edge-themed context menu and use the default Firefox menus.

uc.tweak.revert-context-menu

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Hide Firefox account from app menu

Hides the Firefox account menu item from the app menu (button with three dots), the Firefox account menu can still be accessed from the Firefox account button.

uc.tweak.context-menu.hide-firefox-account

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Compact Extensions Menu

Makes the unified extensions menu more compact, and closer to the design seen in Edge. This hides the permissions indicator label and makes the icons smaller.

uc.tweak.context-menu.compact-extensions-menu

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Acknowledgements

muckSponge - MaterialFox

Microsoft - Fluent UI System Icons

KibSquib48 - MicaFox