There's a serious problem with this specific addon. If you open any youtube channel (just any channel home page, like techquickie for example), the page will just be blank.

Video and everything else loads fine with only 1080p options and stats for nerds shows avc1 is loaded, which is good.

After installing this addon, 60fps no longer works. Even when I uninstall it again, or reinstall Firefox. I don't know what it did, the switch to H264 worked fine, but even rolling back everything the videos are locked to 30fps with no way to fix this.

A very useful extension for those with low internet speed

its good but it dont support higher than 1080p

I am SO done with YouTube's abysmal ways of doing things as they want to.
Thanks tons.

Наконец-то 4к видео можно смотреть.

to działa świetnie ssam tego używam i bardzo pomaga w starszych komputerach

Awesome!! It works perfect

:)