This is absolutely nothing to do with Firefox. The only way that can happen is by running Firefox with sudo, which is completely unsupported
** Package changed: firefox (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1239406 Title: cache folder belongs to root, causing firefox to fail to run To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1239406/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs