CVE-2012-3984
Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly handle navigation away from a web page that has a SELECT element’s menu active, which allows remote attackers to spoof page content via vectors involving absolute positioning and scrolling.
Date published : 2012-10-10
http://www.mozilla.org/security/announce/2012/mfsa2012-75.html