CVE-2012-3985
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.
Date published : 2012-10-10
http://www.mozilla.org/security/announce/2012/mfsa2012-76.html