I'm pretty sure you are all familiar with the adwaita-firefox [1] theme.

It makes Firefox looks more "native" on GNOME, thus making the user experience more consistent.
I suggest we package it and make it default for the desktop spin. This requires:
1) Packaging the theme itself
2) Make firefox use it by default (example from Suse [2])
3) Make sure we don't update Firefox without the theme being updated as well

I think this would be a noticeable improvement in user experience.

[1] https://github.com/adwaita-firefox-team/adwaita-firefox
[2] https://build.opensuse.org/package/files?package=firefox-branding-openSUSE-5&project=mozilla
-Elad Alfassa.