Jules Im gonna file a bug report for you with this info its a flashplugin problem. can you please try upgrading your flashplugin- nonefree to flash9 from the backport repos. I will leave new bug # here. you can comment there on it Thank you.
** Attachment added: "StackTrace" http://librarian.launchpad.net/6563755/Stacktrace -- Firefox Crashed while idling in background https://launchpad.net/bugs/71605 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs