How to overcome 2k/4k youtube video issue on firefox?

Question

YouTube

Good afternoon.

There is such a config: Intel Core i7-4790, GTX-650, 8 GB of RAM, Win 7
I put 2 browsers: Firefox, Chrome

And now, on Firefox 4k / 2k youtube, the video does not work at all, wild strobe and pixels. Only sound is heard.
Everything is perfect on chrome. Tell me, please, what is missing fox?

Answer 1

The problem is that YouTube thinks that your browser does not support MSE & WebM VP9.
Solution 1. Type about:config
in the address bar 2. Find the media.mediasource.webm.enabled parameter 3. Change the value from false to true 4. Restart the browser 5. Enjoy PS: after that, 4k / 2k becomes available with 60 fps

Answer 2

There seems to be a bug