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Re:Firefox nightlies for Linux are now using Gtk+3 by nine_k on Friday July 24, 2015 @09:37AM (#9941871)
I've spent considerable time looking for GTK3 themes that meet your requirements.

My current choice is openSuse-Pistachio which is green, reasonably compact, and did not break for two consecutive Ubuntu releases. zonColor icons work beautifully, too, with adjustable colors.

There are a few more reasonable choices (though not oodles) on gnome-look.org

Re:Firefox nightlies for Linux are now using Gtk+3 by weland on Friday July 24, 2015 @01:00PM (#9943403)
Thanks! I'll keep that in mind for when I run out of choices and have to upgrade :).