Ubuntu Security Notice 602-1 – Flaws were discovered in Firefox which could lead to crashes during JavaScript garbage collection. If a user were tricked into opening a malicious web page, an attacker may be able to crash the browser or possibly execute arbitrary code with the user’s privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/65709/USN-602-1.txt
Source: https://packetstormsecurity.com/files/65709/Ubuntu-Security-Notice-602-1.html