Can you please follow the instructions at https://wiki.ubuntu.com/MozillaTeam/Bugs to obtain a backtrace, so we can have a better understanding of what is causing your crash?
-- [feisty] Firefox Crashed x86_64 https://launchpad.net/bugs/86277 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
