firefox is vulnerable to arbitrary code execution. The vulnerability exists as a web page containing malicious content could cause Firefox to crash or, potentially, execute arbitrary code with the privileges of the user running Firefox.
secunia.com/advisories/37699
secunia.com/advisories/37704
secunia.com/advisories/37785
secunia.com/advisories/37813
secunia.com/advisories/37881
securitytracker.com/id?1023333
securitytracker.com/id?1023334
www.debian.org/security/2009/dsa-1956
www.mozilla.org/security/announce/2009/mfsa2009-65.html
www.mozilla.org/security/known-vulnerabilities/firefox30.html#firefox3.0.16
www.novell.com/linux/security/advisories/2009_63_firefox.html
www.redhat.com/security/updates/classification/#critical
www.securityfocus.com/bid/37349
www.securityfocus.com/bid/37363
www.ubuntu.com/usn/USN-873-1
www.vupen.com/english/advisories/2009/3547
access.redhat.com/errata/RHSA-2009:1674
bugzilla.mozilla.org/show_bug.cgi?id=468771
bugzilla.redhat.com/show_bug.cgi?id=546713
exchange.xforce.ibmcloud.com/vulnerabilities/54801
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8523
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A8584
rhn.redhat.com/errata/RHSA-2009-1674.html