Simply doesn't work, videos in playlists continue autoplay next. (Of course I've refreshed the page...)

Although it does what it's supposed to, it also does something it's not.
It breaks/cancels the screen with the recommended videos at the end of playback. Instead the extension should strive to keep the autoplay setting of youtube disabled. Or otherwise not creating this side-effect.

Doesn't work on Playlists, like your Favorites.

Not sure why it not working anymore, maybe some conflicts with other plugins?

The 61kB download size made it look really promising, but despite many attempts, the install button was permanently grayed out :(