I had this issue, disabling webfav extension cleared it up. There is a very similar bug https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/331866 which may be a duplicate
-- seahorse agent crash with firefox 3.5. https://bugs.launchpad.net/bugs/455469 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
