Best YouTube distraction-blocking app I've used. I've seen other good apps, but this one blocks the most stuff, including things I wouldn't have thought about, like the home feed, the notification bell, the subscription bar, merch, and live chat. Even better, it separates everything out, so for instance you can block the subscriptions bar without blocking the library bar, and you can block the sidebar without blocking playlists. And this extension seems to work perfectly; I've never noticed any issues.