Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly implement the HTML5 Same Origin Policy, which allows remote attackers to conduct cross-site scripting (XSS) attacks by leveraging initial-origin access after document.domain has been set.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16108
https://bugzilla.mozilla.org/show_bug.cgi?id=655649
http://www.ubuntu.com/usn/USN-1611-1
http://www.mozilla.org/security/announce/2012/mfsa2012-76.html
http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html