Judging from the large number of extensions you have, it's quite likely that the problem is a buggy extension. Can you try uninstalling all these addons (and with a fresh profile as well) ? Unless the problem exists with a stock Firefox, we cannot forward the issue upstream so that it can be solved....
-- Segmentation fault in gtk_gc_get () https://launchpad.net/bugs/54043 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
