YouTube now defaults to AV1. The extension was last updated 6 years ago, so it still only blocks VP8/VP9.

EDIT: After changing this setting to false in about:config it works: media.av1.enabled

THANK YOUUUU

Fixed my lag

Perfect. Got an i5 6300hq, was having ~50% CPU usage while watching 1080p@60fps. With this i got 25-30% CPU usage. Thank you!

This add-on fixed my problem with YouTube immediately, I have a high end PC and it was freezing itself at 2x 1080p60. Thank you guys!

Great improvement, in terms of keeping my laptop much cooler. Great extension. 👍

Finally videos don't get pale in full screen. Thanks you!

Installing this fixed hardware video decoding. Now Firefox uses much less CPU even when I watch 4K videos with VP9. Task manager shows HW video decoding works. It was zero before.

Still seems to work, finally no more choppy and painfully slow and in low resulution loading YouTube videos in Firefox, and no need to use YouTube in Chrome as a "workaround".

Ahora me van los videos fluidos gracias a esto Bv

I just discovered this after my other extension to block 60fps on youtube stopped working. This works flawlessly thank youuuu

immediately fixed my problem with lag on youtube