Mozilla Firefox before 3.6.24 and 4.x through 7.0 and Thunderbird before 3.1.6 and 5.0 through 7.0 do not properly handle JavaScript files that contain many functions, which allows user-assisted remote attackers to cause a denial of service (memory corruption and application crash) or possibly have unspecified other impact via a crafted file that is accessed by debugging APIs, as demonstrated by Firebug.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13870
https://bugzilla.mozilla.org/show_bug.cgi?id=674776
http://www.redhat.com/support/errata/RHSA-2011-1439.html
http://www.mozilla.org/security/announce/2011/mfsa2011-49.html
http://lists.opensuse.org/opensuse-security-announce/2011-11/msg00020.html