Somehow it got fixed on it's own. Not sure how, it may be related to updating Feisty. Closing the bug report as I can not say how to reproduce this bug.
** Changed in: firefox (Ubuntu) Status: Needs Info => Rejected -- Firefox default theme gets distorted https://launchpad.net/bugs/76132 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs