Mozilla Firefox is vulnerable to privilege escalation. Due to a flaw found in the way Firefox handled certain add-ons, a web page containing malicious content could cause an add-on to grant itself full browser privileges, which could lead to arbitrary code execution with the privileges of the user running Firefox.
lists.opensuse.org/opensuse-security-announce/2011-11/msg00020.html
www.mozilla.org/security/announce/2011/mfsa2011-46.html
www.mozilla.org/security/known-vulnerabilities/firefox36.html#firefox3.6.24
www.redhat.com/support/errata/RHSA-2011-1439.html
access.redhat.com/errata/RHSA-2011:1437
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=680880
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13550