I followed the wiki steps. It seems the problem comes from an extension. Firefox starts OK in safe-mode.
** Attachment added: "gdb log" http://librarian.launchpad.net/6727157/gdb-firefox.log -- firefox crashes (xpcom) https://launchpad.net/bugs/91073 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
