Mozilla Firefox before 22.0 does not properly enforce the X-Frame-Options protection mechanism, which allows remote attackers to conduct clickjacking attacks via a crafted web site that uses the HTTP server push feature with multipart responses.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16992
https://bugzilla.mozilla.org/show_bug.cgi?id=761667
http://www.ubuntu.com/usn/USN-1890-1
http://www.mozilla.org/security/announce/2013/mfsa2013-58.html
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00005.html
http://lists.opensuse.org/opensuse-security-announce/2013-07/msg00003.html