I seem to have this same problem. I have Radeon M6 GPU and found this bug report: https://bugs.freedesktop.org/show_bug.cgi?id=27510
** Bug watch added: freedesktop.org Bugzilla #27510 http://bugs.freedesktop.org/show_bug.cgi?id=27510 -- [Lucid]NoScript crashes Firefox, crashes X-session https://bugs.launchpad.net/bugs/551754 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