The poor Mozilla folks have recently been accused of hating Linux more than they hate Hitler and Cancer combined, as they threatened to give the Linux build of Firefox the look of the platform most of us decided to move away from. As Mike points out, the diversity of our interfaces kind of suck for ISV/IDS’s like them, but things are getting better [1] and that’s a good thing for dudes like Medsphere and VMWare among others.
I’m happy that #381206 have been given some priority and we’ll do our best to fix it.

1. Fedora actually use the tango-styled Mist by default, OpenSuse use jimmacs nice icons and Ubuntu use quite a bunch of tango styled icons apart from some arrows and folders and stuff.