Just a note, in my original case the problem appears to happen when a second display is configured but not attached. Firefox and Thunderbird do not start unless the second desktop is removed from xorg.conf or the display is attached.
-- Firefox hangs on start https://bugs.launchpad.net/bugs/157132 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs