The crash only seems to occur on when pages containing java applets are displayed.
Attached output of firefox -g 2>&1 | tee ~/Desktop/gdb-firefox.log ** Attachment added: "firefox -g 2>&1 | tee ~/Desktop/gdb-firefox.log" http://librarian.launchpad.net/5800902/ff-debug -- Firefox crashed when user locks screen https://launchpad.net/bugs/80581 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs