Aside from the issue of browser fingerprinting, having too many add-ons may slow down. Now open some HTML5 video from YouTube that did not play initially. Similarly, more is not always better with Firefox browser add-ons. Double click it to change its value to true.
You will see the parameter which is set to false. You can choose to have any of the following rules mark a comment for removal: More than spelling mistakes: The number of mistakes is customizable, and the extension uses Firefox’s built-in spell checker. Type the word: "mediasource" (without quotes) in the filter text box. YouTube Comment Snob is an extension for Firefox that filters out undesirable comments from YouTube comment threads. 
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. I noticed that Firefox was no longer allowing me to copy and paste text in to YouTube comments - quite frustrating when you are trying to manage comments on. By default, this option is off in Firefox, so the browser is not able to play some HTML5 video streams. Youtube Addon FirefoxOpen your Firefox Addon settings page (enter about:addons in the address bar of your browser) Click on the settings dropdown. 
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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