GNOME theme for Firefox
The latest stable version is always available from Mozilla's Add-ons.
List of current issues is available at our bug tracker.
Help & feedback are both appreciated! ;-)
How to build
You can use make-xpi.py script to build xpi and clean temporary files:
$ ./make-xpi.py [TARGET] $ python3 make-xpi.py [TARGET]
Available targets: all, theme, extension and clean. Default is all.
For more details please check this page.
With some tweaks, made available by GNOME Theme Tweak, Firefox can even look close to native on GNOME 3.12+: