This extension pretty much gave me my life and my mind back. It seals the YouTube rabbit hole, putting YouTube under your control (unlike a simple site blocker, which just makes all of YT inaccessible.) It turns YT into a tool, rather than a site that is constantly grabbing at one's attention. For example, if you had intended to search for a video on a certain topic, you can do it without having to ignore the constant stream of irrelevant videos in which you might otherwise be genuinely interested. You won't have to expend any willpower ignoring anything just to watch what you wanted to watch.

One might say, "just use the Firefox search bar, which bypasses the homepage." Oh, it's different. If you accidentally go to youtube.com, you're covered. If you watch a video and finish, nothing prevents you from calmly thinking about what you just watched, since the sidebar and video suggestions wall are now gone and nothing is pulling you away. The feeling of peace you'll feel is profound. It reminds me of how I felt before YouTube existed.

Personal experience: After turning on Unhook, I felt great, but after a few days, I felt empty, bored. That's addiction messing with you. I still didn't feel like turning off Unhook, despite these feelings, and after several days, I felt better. I even spontaneously felt that going outside and taking a walk would better relieve my boredom. (!) It did and I was not even restless. What a wonderful feeling to peacefully enjoy the outdoors again!

You can also unseal the rabbit hole easily if you like. Just press a button and the feature you've unblocked immediately reappears. Everything is under your control.

This developer should be nominated for a Nobel Peace Price. I've donated. If you can, I unhesitatingly encourage you to do so.