Ubuntu Security Notice 645-3 - USN-645-1 fixed vulnerabilities in Firefox and xulrunner. The upstream patches introduced a regression in the saved password handling. While password data was not lost, if a user had saved any passwords with non-ASCII characters, Firefox could not access the password database. This update fixes the problem. A very large amount of vulnerabilities have been addressed in the latest Firefox release from Ubuntu.
a978bbdfecb457451bdcd378563f68292a1897028ca8bed1392915cbdd4b019d