Per https://answers.launchpad.net/ubuntu/+source/firefox/+question/120413 this has been fixed.
** Changed in: firefox (Ubuntu) Status: Incomplete => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/630625 Title: Script file:///usr/lib/firefox-3.6.8/components/nsExtensionManager.js:623 may be busy, or it may have stopped responding To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/630625/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs