Mozilla has released a new version of Firefox, which includes patches for 11 security vulnerabilities. Three of the bugs fixed in Firefox 31 are critical, including a use-after-free vulnerability and a handful of memory safety issues. One of the other critical bugs is an exploitable crash in the Cesium JavaScript library. Firefox users should upgrade their browsers as soon as possible to protect themselves against these vulnerabilities. Mozilla: With enough effort at least some of these vulnerabilities could be exploited to run arbitrary code.
Source: https://threatpost.com/firefox-31-patches-11-security-flaws/107372/