Folks from Collabora and Red Hat have been working on making Firefox on Gtk+ 3 a thing. See Emilio’s blog post for some recent update. But getting Firefox to build and run locally is unfortunately not the whole story.
I’ve been working on getting Gtk+ 3 Firefox builds going on Mozilla build infrastructure, and I’m proud to announce today that those builds are now going through Mozilla continuous integration on a project branch: Elm, and receive the same automated testing as mozilla-central.
And when I said getting Firefox to build and run was unfortunately not the whole story, I meant it: if you click on the Elm link above, you’ll notice that there’s a lot of orange, when it should be all green.