Bei mir war nicht fest zu stellen, das sich dort nun ein anderes Tool, als "das Übliche von Google/YouTube" am arbeiten war.

. doesn't works

This add-ons stop working with FF69 and above

Doesn't work

It's true, it's utterly useless.

SImply does not work.

does not work

Broken.

Don't work in Quantum.

Doesn't work at all

Doesn't work at all

Doesn't work.

You did add the feature to a degree however it is very low frame rate gets a slight zoomed in and the quality is extremely low.

Doesn't work.

Doesn't work (classic layout, Firefox 59.0.2 64-Bit)

didn't worked for firefox quantum