How to get 1080p in Youtube’s HTML5 player in Firefox

Recently, I updated my Firefox browser, and when I was watching Youtube, I couldn’t get 1080p HD anymore. 🙁

I found this article and it solved my issue. Let me remember these steps just in case in future it happened again.

  1. Enter
     about:config

    in your address bar to get to the advanced configuration page. Click “I’ll be careful, I promise” (and actually be careful because you can break all sorts of things in there if you’re not!) to continue.

  2. Search
    "mediasource"

    to see the options you need.

  3. Double-click both “media.mediasource.enabled” and “media.mediasource.webm.enabled” in order to change their value to “true”.

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