Currently seems to not be working as blocking VP8/VP9 means videos are played in AV1. Even when AV1 playback is technically disabled in Youtube settings.
For me this is overall worse as AV1 seems to use more resources than VP9.

I've used this add-on for years, but eventually I realized that as of 2024 this is what's blocking Youtube from playing any videos above 1080p. I don't know why, but no video on Youtube will show the option of playing above 1080p when this extension is enabled and plenty of videos allow up to 2160p when this extension is disabled.

Ahora me van los videos fluidos gracias a esto Bv

Correctly installed/setup, but failed to work in multiple instances

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

only need one word *amazing

h264ify is a must-have for smooth video streaming. It's like a magic wand for your browser. No more buffering or lag – it just works. Love it!

Ohh nooo. If you want them to see everything you do in your browser, including user name and password for Where ever you are are. Go right ahead and install this.

Thanks

Super.

This addon is amazing. Before installing, I could barely get over 5 fps with 720p videos. Now I get smooth 60 fps with 1080p.

en una PC de poco recurso sirve.

I used this extension on Opera, Brave and it was OK, but in firefox it makes youtube be laggy

It will work but just so you know, this addon removes the settings for above 1080p video quality (like 4K).
It also seems like it has been abandoned by it's current author.

Fixed youtube high CPU usage. I think Mozilla should add this extension to recommended ones.
PS. For your knowledge the max resolution you will get using this extension is 1080p.