FINALLY! After trying out every single channel blocker above this one on the search list, I finally found one that works. now, let's see how LONG it works; before YouTube breaks it.

Just found out it's not compatible with the "restore old theme of youtube" addon. That will break it! "youtube classic" works though.

11/11/2019 The new YouTube update broke it and now the red x isn't showing up.

11/12/2019 Problem solved! Thank you so much to the devs at Time Machine Develpment for taking care of that so quickly.

12/24/2019 A script in the addon is causing firefox to lag. Irritating, but not game-breaking

"X" button does not show up at all

great replacement for video blocker but the only problem is that their is no way to import the 2000 channel i blocked from video blocker to this so i have to block one by one from the beginning

Stopped working for some unknown reason, but now it works after reinstalling

Great add-on. Browsing youtube is fun again.
It's super simple to use and the x buttons are nicely integrated in the site.

Doesn't work ..

Doesn't work most of the times. Sometimes it does, sometimes it doesn't. I just wanted to block videos to certain games that I wanted to play for myself without getting spoiled by some videos (titles and such).

Barely works, completely stopped allowing me to block channels or videos and I was still able to access so-called "blocked" channels. Rubbish.

Works fine on new Youtube but, it doesn't work with Classic Youtube add-on, which makes it pretty useless for me.

its great. my home page looks absolutely amasing ive blocked nearly every talk show host childrens channle and shitty clickbait trash channles and my recommendations have become cleaner

Perfect. I can finally get that cunt Afro's playlist off of my sidebar. After two months, blocking his channel didn't work, reporting and disliking the videos didn't work. But an add-on that puts a simple "X" over the playlist, that fixed it.

Excellent addon. Never had a problem with it, and it nicely cleans up all the stupidity in youtubes recommended algorithm.

5/5 so far for me. However I would like to make a small suggestion. It would be great if exclusions could also be done by video title. There are channels I'm not interested, but I might still enjoy a video they release of a specific subject

This is a great extension so far. Works great !

Not much use... Worked for a day, next morning when the machine was re-booted offending videos/channels were back and the 'X' had stopped working! - It was there, it had just stopped doing anything other than flickering when clicked! - It's also not easy (or maybe not possible) to get it to just tackle YouTube's recommendations without completely blocking channels! - Just, no good... What I really need is a one-click blocker that also sends YouTube the 'not interested' message - and doesn't die after 24 hours!

does not work with classic layout
otherwise would probably be 6+ out of 5

video blockerが効かなくなり、クソ動画やクソコメントにいらついていたがこのアドオンのおかげで、こびりついたクソを一掃できた。ありがとう！

I love it. It is really simple to use but provides room for you to get as specific as you want using regular expressions. It doesn't add unneeded garbage that you were not looking for. It's super light-weight and won't interrupt your experience or make your youtube tab crash.

I've been using it to block clickbait channels from populating my recommended section, haven't seen the words Mojo or Buzzfeed in a while and couldn't be happier about it.

5/5

I managed to get this to work. You just have to be careful about what you 'input' for blocking channels. For example:

To block channel "Creators Tutorials" you must view one of their videos. Then click on the avatar/name which is on the left side of the screen, just below the actual video. That takes you to what I call their channel home page. For the this example, the url is:

https://www.youtube.com/channel/UC2e8r3D4hXZWVhkFJGpL7QQ

So the string to enter into the channel blocker input box is: "UC2e8r3D4hXZWVhkFJGpL7QQ", not "Creators Tutorials". After that you won't be able to find their videos, unless you use a different browser.

Sorry for the clumsy dialog. I hope this helps.

PS: "Creators Tutorials" is just a channel I picked at random. No criticism intended. I just wanted to use a real example.