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1.1K Stars 71 Forks The Unlicense 717 Commits 21 Opened issues


A GNOME👣 theme for Firefox🔥

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Firefox GNOME theme
Firefox GNOME theme

GitHub Donate Liberapay

A GNOME theme for Firefox

This theme follows lastest GNOME Adwaita style.

Screenshot of the theme


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

Firefox versions support


branch of this repo supports the current Firefox stable release

Theme versions complatible with older Firefox releases are preserved as git tags. Use the

tag for Firefox 78 ESR support.

We also have the

branch for fixes only aplicable to the current Firefox beta version.


Installation script

  1. Clone this repo and enter folder:

    git clone && cd firefox-gnome-theme
  2. Checkout a git branch or tag if needed, otherwise use

    and ignore this step.
    git checkout beta # Set beta branch 
    git checkout v78.1 # Set v78.1 tag 
  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.


    Install script

    ./scripts/ # Standard
    ./scripts/ -f ~/.var/app/org.mozilla.firefox/.mozilla/firefox # Flatpak
    Script options
    • -f 
      • Set custom Firefox folder path, for example
      • Default:
- `-p ` *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, yaru.

One command curled script

You can also install this theme with one command:

curl -s -o- | bash

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

Manual installation

  1. Go to

    in Firefox.
  2. Application Basics > Profile Directory > Open Directory.

  3. Open directory in a terminal.

  4. Create a

    directory if it doesn't exist:
    mkdir -p chrome
    cd chrome
  5. Clone this repo to a subdirectory:

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

    [[ -s userChrome.css ]] || echo >> userChrome.css
  7. Import this theme at the beginning of the CSS files (all

    s must come before any existing
    sed -i '1s/^/@import "firefox-gnome-theme\/userChrome.css";\n/' userChrome.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

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

  • 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



Both manual and script installation methods should create a git clone in

, so the easiet way to update the theme is to open this folder in terminal and perform a git pull.
git pull origin master

Note: You can also run the installation script again to update (after cloning again the repo).


  1. Go to your profile folder. (Go to
    in Firefox > Application Basics > Profile Directory > Open Directory)
  2. Remove


  • Hide single tab


    Hide the tab bar when only one tab is open.

    Note: You should move the new tab button somewhere else for this to work, because by default it is on the tab bar too. See #54.

  • Spinner


    Use the GNOME spinner for tabs loading.

    Note: This is optional because Firefox has issues rendering the spinner SVG:

    GTK Spinner

  • Normal width tabs


    Use normal width tabs as default Firefox.

  • Bookmarks toolbar under tabs


    Move Bookmarks toolbar under tabs.

  • Active tab contrast


    Add more contrast to the active tab.

  • System icons


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

    Note: This feature has a known color bug.

  • Symbolic tab icons


    Make all tab icons look kinda like symbolic icons.

  • Hide WebRTC indicator


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

  • Drag window from headerbar buttons


    Allow draging the window from headerbar buttons.

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

Known bugs

CSD have sharp corners

See upstream bug.

Wayland fix:

  1. Go to the
  2. Search for the
    preference and set it to true.
  3. Now restart Firefox, and it should look good!

X11 fix:

  1. Go to the
  2. Type
  3. Set it as a
    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

file, look for
vars and play with css filters.


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.


Developed by Rafael Mardojai CM and contributors. Based on Sai Kurogetsu original work.


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

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