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.
- 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.
- Search
"mediasource"
to see the options you need.
- Double-click both “media.mediasource.enabled” and “media.mediasource.webm.enabled” in order to change their value to “true”.