Simple, lightweight and accurate!
I got positively surprised that it works on so many different sites. It's very fast accessible and very handy. Definitely a 5/5.

They have improved so much that the add on is nearly perfect now! One of the golden trio for add ons to Firefox! 🌟

What I miss:
1. An option for a default playback speed / to lock a speed setting for all the videos and sites. (Just a box to check with "lock current speed" and to uncheck when watching videos in normal speed.)

Thank you so much for a great add-on and service!