I have been using Gnome 3 from the overlay for a while. After emerging Firefox 5, it would crash when opening many sites. Eventually, I found that disabling JavaScript prevented these crashes. I found someone else on the German forums with the same problem, who solved it by remerging libproxy with USE="-xulrunner". The same fix worked for me. Turns out that the libproxy ebuild from the main tree has had the xulrunner use flag disabled for a while due to bug #360893 and thus didn't run into this problem. The ebuild in the overlay should probably be changed accordingly. In fact, isn't the only change required from the official ebuild the removal of ":2" on the gconf line?
Thanks for the report, libproxy has now been removed from the overlay (it was put in the overlay to support webkit-gtk:3; with USE=webkit disabled, keeping it in the overlay serves no real purpuse).
Fixed then, thanks tetromino
