Does not work at all.

Just offered options for HDQ and LQ, but no setting works.

Hervorragendes Tool um gegebenenfalls Bandbreite zu sparen

This does work. "Youtube center dev build" does not work for some reason, So I downloaded this and it is working as intended. Thanks.

i have low bandwidth in parts of my home.
so the "i-auto-your-video-quality-because-reasons-youre-welcome-greetings-youtube" is very annoying.
this extension works like a charm.

neg:
can't select a higher quality manually in the video options (e.g. if i want to read something that's shown in a video). the extension will force it back.

tip:
don't activate/change the quality of the extension if you have >50 youtube tabs open.
it will reload them all at once.

edit:
doesn't work anymore. not recommended

Thank you, this works with mobile firefox too!

rarely works

Best Auto HD Extension for YouTube, because it actually works, but I can't change the quality to lower, because it automatically goes back up.