You can also just edit the menu entry of firefox and append "aoss" to the start of the command name. That is, instead of "firefox %u" use "aoss firefox %u".
By the way, this bug is widely confirmed. -- Problem with flash plugin in firefox https://launchpad.net/bugs/45803 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
