My Firefox was having issues with YouTube videos lately. It's double buffering at the start of video playback and seems to be stuttering on some parts, like skipping or going back a second. It only started happening with FF 96 updates.

I got so annoyed that it wasn't happening with my secondary GX browser. I started searching and found a thread leading to this addon and bam. It fixed the very problems i was having. No more buffering, no more stuttering/lag/skip, etc. Thank you so very much.

Doesn't seem to be working any more?... I just turned it on, restarted Firefox, and checked stats on a YT video, still says vp09

Expected it to force 4k video to use h.264, but it just completely blocks it instead. Should've been made clear in description. The add-on only allows up to 1080p after installing.

It does block VP9 but I didn't notice a change in CPU usage...

Le son est sacadé

Took the CPU usage on youtube from 8-12% to 2-5% on a 5 year-old gaming PC. It really does wonders.

Works really well and as intended ! It made Youtube videos way smoother

totally fixed stuttering on youtube. even with a gaming PC VP8/VP9 causes issues

Great addon, thanks )