firefox is vulnerable to arbitrary code execution. Several flaws were found in the processing of malformed web content. A web page containing malicious content could cause Firefox to crash or, potentially, execute arbitrary code with the privileges of the user running Firefox.
code.google.com/p/ots/
lists.fedoraproject.org/pipermail/package-announce/2010-December/052022.html
lists.fedoraproject.org/pipermail/package-announce/2010-December/052032.html
lists.fedoraproject.org/pipermail/package-announce/2010-December/052502.html
lists.fedoraproject.org/pipermail/package-announce/2010-December/052504.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00002.html
secunia.com/advisories/42716
secunia.com/advisories/42818
support.avaya.com/css/P8/documents/100124650
www.mandriva.com/security/advisories?name=MDVSA-2010:251
www.mozilla.org/security/announce/2010/mfsa2010-80.html
www.mozilla.org/security/known-vulnerabilities/firefox36.html#firefox3.6.13
www.redhat.com/support/errata/RHSA-2010-0966.html
www.securityfocus.com/bid/45326
www.securitytracker.com/id?1024848
www.ubuntu.com/usn/USN-1019-1
www.vupen.com/english/advisories/2011/0030
www.zerodayinitiative.com/advisories/ZDI-10-264/
access.redhat.com/errata/RHSA-2010:0966
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=590771
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12649