A GNOME theme for Firefox

This theme follows lastest GNOME Adwaita style.

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

This theme is supposed to work with current supported Firefox releases:

• Firefox 72
• Firefox 68 ESR
• Firefox 73 Beta
• Firefox 74 Nightly

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

• -f <firefox_folder> optional

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

• -p <profile_folder> optional

  • Set custom profile folder name, for example e0j6yb0p.default-nightly
  • Default: *.default (standard default profile)

• -g optional

  • Auto enable GNOMISH extra features hide-single-tab.css & matching-autocomplete-width.css

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

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

8. Symlink preferences file:

   ln -s 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.

Both manual and script installation methods should create a git clone in your-profile-folder-path/chrome/firefox-gnome-theme, 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: Running installation script to update after cloning again the repo can work, but also can introduce duplication in CSS sheets.

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

To achieve Firefox with overlay scrollbars install firefox-gnome-scrollbars.

Open chrome/firefox-gnome-theme/userChrome.css with a text editor and follow instructions to enable extra features. Keep in mind this file might change in future versions and your configuration will be lost. You can copy the @imports you want to enable to a new file named customChrome.css directly in your chrome/firefox-gnome-theme directory if you want it to survive updates. Remember all @imports must be at the top of the file, before other statements.

Alternatively you can run installation script with -g flag to auto install GNOMISH features.

./scripts/install.sh -g

Those features are not included by default, because can introduce bugs or Firefox functionalities lost.

• hide-single-tab.css GNOMISH

  Hide the tab bar when only one tab is open.

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

• matching-autocomplete-width.css GNOMISH (FF 60-69)

  Limit the URL bar's autocompletion popup's width to the URL bar's width.

  This feature is included by default for Firefox 70+

• square-title-buttons.css

  Use square title buttons old style.

• normal-width-tabs.css

  Use normal width tabs.

• active-tab-contrast.css

  Active tab better contrast.

• system-icons.css

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

• drag-window-headerbar-buttons.css

  Allow drag window from headerbar buttons GNOMISH [BUGGED]

  It can activate button action, with unpleasant behavior.

• symbolic-tab-icons.css

  Make all tab icons look kinda like symbolic icons.

See upstream bug.

To solve it, go to the about:config page and type this: mozilla.widget.use-argb-visuals.

Set it as a boolean and click on the add button.

Now reboot, and it should look good !

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.

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.