firefox is vulnerable to cross-site scripting. A cross-site scripting (XSS) flaw was found in the Firefox x-mac-arabic, x-mac-farsi, and x-mac-hebrew character encodings. Certain characters were converted to angle brackets when displayed. If server-side script filtering missed these cases, it could result in Firefox executing JavaScript code with the permissions of a different website.
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.debian.org/security/2010/dsa-2132
www.mandriva.com/security/advisories?name=MDVSA-2010:251
www.mozilla.org/security/announce/2010/mfsa2010-84.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/45353
www.securitytracker.com/id?1024851
www.ubuntu.com/usn/USN-1019-1
www.vupen.com/english/advisories/2011/0030
access.redhat.com/errata/RHSA-2010:0966
access.redhat.com/security/updates/classification/#critical
bugzilla.mozilla.org/show_bug.cgi?id=601429
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12348