Ubuntu Security Notice 975-2 – USN-975-1 fixed vulnerabilities in Firefox and Xulrunner. Some users reported stability problems under certain circumstances. This update fixes the problem. Several dangling pointer vulnerabilities were discovered in Firefox. Blake Kaplan and Michal Zalewski discovered several weaknesses in the XPCSafeJSObjectWrapper (SJOW) security wrapper. Various other issues were addressed.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/93994/USN-975-2.txt
Source: https://packetstormsecurity.com/files/93994/Ubuntu-Security-Notice-975-2.html