Mozilla Firefox before 8.0 and Thunderbird before 8.0 on Mac OS X do not properly interact with the GPU memory behavior of a certain driver for Intel integrated GPUs, which allows remote attackers to bypass the Same Origin Policy and read image data via vectors related to WebGL textures.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A13347
https://bugzilla.mozilla.org/show_bug.cgi?id=684882
http://www.mozilla.org/security/announce/2011/mfsa2011-51.html
http://lists.opensuse.org/opensuse-security-announce/2011-11/msg00020.html