Unrecommender

https://github.com/memethyl/Unrecommender

The Unrecommender solves a problem that countless YouTube users have long griped about:

"How do I make recommendations not suck so much?"

No matter how hard you try, or how many times you hit "Not interested", the site just won't give you a break; it INSISTS that you should watch Vine compilations, or Fortnite videos, or any number of other things you don't care about.

The Unrecommender solves this problem in two ways:
1. When watching videos, it hides anything that isn't from the channel you're watching. For example, if you were watching a Tom Scott video, it'd only show videos from Tom Scott, and so on.
2. When on the homepage (or trending page), it hides anything from any channel not on your subscription list.

You also don't have to fuss around with blacklists to make it work: just install it, and it does the rest for you.