firefox is vulnerable to same-origin policy bypass. An attacker could create a malicious web page that, when viewed by a victim, could steal private data from a different website the victim had loaded with Firefox.
blogs.sun.com/security/entry/multiple_vulnerabilities_in_mozilla_firefox
lists.fedoraproject.org/pipermail/package-announce/2010-October/050077.html
lists.fedoraproject.org/pipermail/package-announce/2010-October/050154.html
secunia.com/advisories/42867
support.avaya.com/css/P8/documents/100120156
www.debian.org/security/2010/dsa-2124
www.mandriva.com/security/advisories?name=MDVSA-2010:210
www.mandriva.com/security/advisories?name=MDVSA-2010:211
www.mozilla.com/en-US/firefox/3.6.11/releasenotes/
www.mozilla.com/en-US/firefox/3.6.12/releasenotes/
www.mozilla.org/security/announce/2010/mfsa2010-69.html
www.mozilla.org/security/known-vulnerabilities/firefox36.html#firefox3.6.11
www.mozilla.org/security/known-vulnerabilities/firefox36.html#firefox3.6.12
www.redhat.com/security/updates/classification/#critical
www.redhat.com/support/errata/RHSA-2010-0782.html
www.redhat.com/support/errata/RHSA-2010-0861.html
www.redhat.com/support/errata/RHSA-2010-0896.html
www.securityfocus.com/bid/44252
www.ubuntu.com/usn/USN-997-1
www.ubuntu.com/usn/USN-998-1
www.vupen.com/english/advisories/2011/0061
access.redhat.com/errata/RHSA-2010:0861
bugzilla.mozilla.org/show_bug.cgi?id=576616
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12120