firefox is vulnerable to privilege escalation. The vulnerability exists when the Firebug add-on is in use. The XMLHttpRequestSpy module in the Firebug add-on exposes a Chrome privilege escalation flaw that could be used to execute arbitrary JavaScript with the privileges of the user running Firefox.
lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.html
lists.opensuse.org/opensuse-security-announce/2011-01/msg00002.html
secunia.com/advisories/3924
secunia.com/advisories/39243
secunia.com/advisories/39308
secunia.com/advisories/39397
secunia.com/advisories/42818
securitytracker.com/id?1023783
support.avaya.com/css/P8/documents/100124650
ubuntu.com/usn/usn-921-1
www.debian.org/security/2010/dsa-2027
www.mandriva.com/security/advisories?name=MDVSA-2010:070
www.mandriva.com/security/advisories?name=MDVSA-2010:251
www.mozilla.org/security/announce/2010/mfsa2010-21.html
www.mozilla.org/security/known-vulnerabilities/firefox30.html#firefox3.0.19
www.redhat.com/security/updates/classification/#critical
www.redhat.com/support/errata/RHSA-2010-0332.html
www.securityfocus.com/bid/39124
www.vupen.com/english/advisories/2010/0748
www.vupen.com/english/advisories/2010/0764
www.vupen.com/english/advisories/2010/0781
www.vupen.com/english/advisories/2010/0849
www.vupen.com/english/advisories/2011/0030
access.redhat.com/errata/RHSA-2010:0332
bugzilla.mozilla.org/show_bug.cgi?id=504021
exchange.xforce.ibmcloud.com/vulnerabilities/57394
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6971
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9446