In version 2.0.17 the option " Use the available space based on the viewport dimensions to expand the video player " doesn't resize the video correctly, it's taller than the viewport and the control bar is displayed off screen.
Now has ads.

I'm missing 1 feature and that is bookmarking a YouTube video where you can timestamp the video so whenever you left, you can watch it again on that timestamp.

i like it!
its great!
i use it everyday.
one suggestion, i would like to control the "shortcut key" to reverse or forward the video as i would with keyboard from my mouse. thanks a lot and good work.

Now has ads

After a recent update 2021-09 it has disabled using my mouse wheel to control video volume of YouTube videos—unless I reload the web page—a nuisance. Videos opened in background no longer allow scroll wheel volume control. When it is working after a reload, if I click a link to another video the volume control is OK. It is not working when I load a new video in the background. So sad. How can I restore the older version?

Complemento indispensable para aprovechar youtube al máximo

Been an absolute must have in my browser since I discovered it, however like others have said, the scroll wheel volume control has been broken, working on/off since last update.
And causes videos to load slower, sometimes even buffering for 10 seconds before the video finally plays, sometimes it will load indefinitely.
Seems the addon has a problem hooking to the page, sometimes it will not have any function at all.

A true must-have add-on for Firefox, it makes YouTube bearable again. I really appreciate the ability to allow ads for channels I subscribe to.

Great extention. The JS injection feature is great. A CSS injection feature would be nice.

muy bueno

good

A must have add on!