Mozilla has patched a number of critical vulnerabilities in Firefox 44 and Firefox Extended Release 38.6. The most serious flaws were memory vulnerabilities that lived in both the public and extended support versions of the browser. A buffer overflow (write) in WebGL, the browser s Web graphics library, was patched. Mozilla said the flaws cannot be exploited through Thunderbird where scripting is disabled, but cautioned against the risk in browser-like contexts It also addressed several memory safety bugs in the engine used in Firefox.
Source: https://threatpost.com/mozilla-patches-critical-vulnerabilities-in-firefox-44/116033/