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

    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

    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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