firefox is vulnerable to arbitrary code execution. A use-after-free flaw was found in the way Firefox appended frame and iframe elements to a DOM tree when the NoScript add-on was enabled. Malicious HTML content could cause Firefox to execute arbitrary code with the privileges of the user running Firefox.
blogs.oracle.com/sunsecurity/entry/multiple_vulnerabilities_in_thunderbird
downloads.avaya.com/css/P8/documents/100134543
downloads.avaya.com/css/P8/documents/100144158
www.debian.org/security/2011/dsa-2227
www.debian.org/security/2011/dsa-2228
www.debian.org/security/2011/dsa-2235
www.mandriva.com/security/advisories?name=MDVSA-2011:079
www.mandriva.com/security/advisories?name=MDVSA-2011:080
www.mozilla.org/security/announce/2011/mfsa2011-12.html
www.mozilla.org/security/known-vulnerabilities/firefox36.html#firefox3.6.17
www.securityfocus.com/bid/47655
access.redhat.com/errata/RHSA-2011:0471
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=624187
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14038