Firefox GNOME theme

A GNOME theme for Firefox

This theme follows latest GNOME Adwaita style.

Disclaimer:

Be aware that this theme might do things that are not supported by upstream Firefox. If you face an issue while using this theme, report it here first or test if it is reproducible in vanilla Firefox.

If you are a software distribution maintainer, please do not ship this changes by default to your users unless you made extremely clear that they are using a modified version of Firefox UI.

Description

This is a bunch of CSS code to make Firefox look closer to GNOME's native apps.

Getting in Touch

Matrix room: #firefox-gnome-theme:matrix.org

Firefox versions support

The master branch of this repo supports the current Firefox stable release 116.

Theme versions compatible with older Firefox releases are preserved as git tags.

We also have the beta branch for fixes only applicable to the current Firefox beta version.

Installation

Installation script

1. Clone this repo and enter folder:

   git clone https://github.com/rafaelmardojai/firefox-gnome-theme && cd firefox-gnome-theme

2. Checkout a git branch or tag if needed, otherwise use master and ignore this step.

   git checkout beta # Set beta branch
   git checkout v78.1 # Set v78.1 tag
   git checkout v$(firefox --version | cut -d ' ' -f 3 | cut -d '.' -f 1) # Using Firefox version

3. Run installation script

   Auto install script

   This script will lookup Firefox profiles location and enable a theme variant for your GTK theme if it exists.

   ./scripts/auto-install.sh

   Install script

   ./scripts/install.sh # Standard
   ./scripts/install.sh -f ~/.var/app/org.mozilla.firefox/.mozilla/firefox # Flatpak
   ./scripts/install.sh -f ~/snap/firefox/common/.mozilla/firefox #Snap

   Script options

   • -f <firefox_folder_path> optional

     • Set custom Firefox folder path, for example ~/.mozilla/icecat/.
     • Default: ~/.mozilla/firefox/

   • -p <profile_name> optional

     • Set custom profile name, for example e0j6yb0p.default-nightly.
     • Default: All the profiles found in the firefox folder

   • -t <theme_name> optional

     • Set the colors used in the theme.
     • Default: Adwaita.
     • Options: adwaita, maia.

One command curled script

You can also install this theme with one command:

curl -s -o- https://raw.githubusercontent.com/rafaelmardojai/firefox-gnome-theme/master/scripts/install-by-curl.sh | bash

It will download the latest version of the theme and run the auto installation script for you.

Manual installation

1. Go to about:support in Firefox.

2. Application Basics > Profile Directory > Open Directory.

3. Open directory in a terminal.

4. Create a chrome directory if it doesn't exist:

   mkdir -p chrome
   cd chrome

5. Clone this repo to a subdirectory:

   git clone https://github.com/rafaelmardojai/firefox-gnome-theme.git

6. Create single-line user CSS files if non-existent or empty (at least one line is needed for sed):

   [[ -s userChrome.css ]] || echo >> userChrome.css
   [[ -s userContent.css ]] || echo >> userContent.css

7. Import this theme at the beginning of the CSS files (all @imports must come before any existing @namespace declarations):

   sed -i '1s/^/@import "firefox-gnome-theme\/userChrome.css";\n/' userChrome.css
   sed -i '1s/^/@import "firefox-gnome-theme\/userContent.css";\n/' userContent.css

8. Symlink preferences file:

   cd .. # Go back to the profile directory
   ln -fs chrome/firefox-gnome-theme/configuration/user.js user.js

9. Restart Firefox.

10. Open Firefox customization panel and move the new tab button to headerbar.

11. Be happy with your new gnomish Firefox.

Required Firefox preferences

We provide a user.js configuration file in configuration/user.js that enable some preferences required by this theme to work.

You should already have this file installed if you followed one of the installation methods, but in any case be sure this preferences are enabled under about:config:

• toolkit.legacyUserProfileCustomizations.stylesheets

  This preference is required to load the custom CSS in Firefox, otherwise the theme wouldn't work.

• svg.context-properties.content.enabled

  This preference is required to recolor the icons, otherwise you will get black icons everywhere.

For other non essential preferences checkout configuration/user.js.

Updating

You can follow the installation script steps again to update the theme.

Uninstalling

1. Go to your profile folder. (Go to about:support in Firefox > Application Basics > Profile Directory > Open Directory)
2. Remove chrome folder.
3. Remove the unwanted preferences from your user.js inside your profile folder. The install script append the needed prefs in that file, you can check what preferences does it append by checking configuration/user.js in this repo.

Enabling optional features

Optional features can be enabled by creating new boolean preferences in about:config.

1. Go to the about:config page
2. Type the key of the feature you want to enable
3. Set it as a boolean and click on the add button
4. Restart Firefox

Features

• Hide single tab gnomeTheme.hideSingleTab

  Hide the tab bar when only one tab is open.

  Note: You should move the new tab button out of the tabbar or it will be hidden when there is only one tab. You can rearrange the toolbars doing a right-click on any toolbar and selecting "Customize Toolbar…".

• Normal width tabs gnomeTheme.normalWidthTabs

  Use normal width tabs as default Firefox.

• Bookmarks toolbar under tabs gnomeTheme.bookmarksToolbarUnderTabs

  Move Bookmarks toolbar under tabs.

• Active tab contrast gnomeTheme.activeTabContrast

  Add more contrast to the active tab.

• Close only selected tabs gnomeTheme.closeOnlySelectedTabs

  Show the close button on the selected tab only.

• System icons gnomeTheme.systemIcons

  Use system theme icons instead of Adwaita icons included by theme.

  Note: This feature has a known color bug.

• Symbolic tab icons gnomeTheme.symbolicTabIcons

  Make all tab icons look kinda like symbolic icons.

• Hide WebRTC indicator gnomeTheme.hideWebrtcIndicator

  Hide redundant WebRTC indicator since GNOME provides their own privacy icons in the top right.

• Hide unified extensions button gnomeTheme.hideUnifiedExtensions

  Hide unified extensions button from the navbar, you can also use extensions.unifiedExtensions.enabled instead, which is only going to work till Firefox 111.

• Drag window from headerbar buttons gnomeTheme.dragWindowHeaderbarButtons

  Allow dragging the window from headerbar buttons.

  Note: This feature is BUGGED. It can activate the button with unpleasant behavior.

• Tabs as headerbar gnomeTheme.tabsAsHeaderbar

  Place the tabs on the top of the window, and use the tabs bar to hold the window controls, like Firefox's standard tab bar.

  Note: Enabling with gnomeTheme.hideSingleTab will replace the single tab with a title bar.

Extensions support

We also have optional features to enable support for some Firefox extensions.

Be aware that extensions support are maintained by the community, so requests to support new extensions are not allowed and the included ones could get broken until someone shows up to fix them.

• Tab center reborn support gnomeTheme.extensions.tabCenterReborn

  Enable the vertical tab trough the extension : Tab Center Reborn.

  Note: You also need to copy the contents of the file configuration/extensions/tab-center-reborn.css into the settings page of Tabcenter-reborn..
  Note2: You can also maintain the vertical tab always open with gnomeTheme.extensions.tabCenterReborn.alwaysOpen

Known bugs

CSD have sharp corners

See upstream bug.

Wayland fix:

1. Go to the about:config page
2. Search for the layers.acceleration.force-enabled preference and set it to true.
3. Now restart Firefox, and it should look good!

X11 fix:

1. Go to the about:config page
2. Type mozilla.widget.use-argb-visuals
3. Set it as a boolean and click on the add button
4. Now restart Firefox, and it should look good!

Icons color broken with System icons

Icons might appear black where they should be white on some systems. I have no idea why, but you can adjust them directly in the system-icons.css file, look for --gnome-icons-hack-filter & --gnome-window-icons-hack-filter vars and play with css filters.

Development

If you wanna mess around the styles and change something, you might find these things useful.

To use the Inspector to debug the UI, open the developer tools (F12) on any page, go to options, check both of those:

• Enable browser chrome and add-on debugging toolboxes
• Enable remote debugging

Now you can close those tools and press Ctrl+Alt+Shift+I to Inspect the browser UI.

Also you can inspect any GTK3 application, for example type this into a terminal and it will run Epiphany with the GTK Inspector, so you can check the CSS styles of its elements too.

GTK_DEBUG=interactive epiphany

Feel free to use any parts of my code to develop your own themes, I don't force any specific license on your code.

Credits

Developed by Rafael Mardojai CM and contributors. Based on Luna Kurame's original work.

Donate

If you want to support development, consider donating via PayPal. Also consider donating upstream, Firefox & GNOME.