Gentoo has issued updates for mozilla-firefox, mozilla-firefox-bin, seamonkey, seamonkey-bin, mozilla-thunderbird, mozilla-thunderbird-bin, and xulrunner. These fix some weaknesses and vulnerabilities, which can be exploited by malicious people to disclose sensitive information, conduct cross-site scripting attacks, bypass certain security restrictions, conduct spoofing attacks, or to compromise a user’s system.
http://secunia.com/software_inspector/