Double click it to change its value to true. You will see the parameter which is set to false.Type the word: "mediasource" (without quotes) in the filter text box.Click "I'll be careful, I promise!" to continue to the about:config page. Note: A warning page may appear that says "This might void your warranty!". Open the Firefox browser and type the following in the address bar: about:config.If you prefer HTML5 videos over the Adobe Flash Player, you might want to enable Media Source Extensions to get advanced support of HTML5 videos in Firefox. By default, this option is off in Firefox, so the browser is not able to play some HTML5 video streams. Those videos require the Media Source Extensions feature which is disabled by default in Firefox. It supports the required HTMLVideoElement, but some videos do not play anyway.
While Mozilla Firefox has good support for HTML5 standards, you might have noticed that it does not support all features required to play videos on YouTube without having Adobe Flash Player installed. RECOMMENDED: Click here to fix Windows issues and optimize system performance
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