# Why is Firefox not vulnerable to Stagefright?

This answer (to what can you do about Stagefright) says "use Firefox". Why is FF not vulnerable and Chrome is?

Firefox have used Android's StageFright Media Library which is disabled by default in Firefox for Android after the stage fright issue is found in Android devices. So the Firefox browser tries to use the Hardware decoder first and then the software decoder as a fallback. You can see the about:config page and search for stagefright keyword. Based on this article,
So if you are using Firefox make sure that the about:config values for the flags media.stagefright.omxcodec.flags and stagefright.disabled and stagefright.force-enabled stays default (i.e. 0, false, false).
• Yes, stagefright.disable = false is correct and is the default value. Updated the answer with screenshot with default values of a freshly installed Firefox. – Lucky Sep 2 '15 at 13:40