David, the issue with your crash report is that it does not have debugging symbols attached to it. Have you installed the debugging symbols (in a terminal: sudo apt-get install firefox-dbg). Then when there is a crash, a file will appear on your desktop and that is the file we want.
-- Firefox crashed. Unsure of cause https://launchpad.net/bugs/84911 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs