I tried this add-on version 5.2.5 and it works great! Not flawlessly strangely enough because doing it manually just doesn't work great. But for instance you look for the name of a channel you don't like, you right-click on the channel's name and select "Block videos from this channel" and then you refresh the page, they won't be showing up on the list anymore. It's just perfect. There's some YouTubers I can't stand so I think this add-on works great for that!