[timbit42]

I find "BlockTube" OK for blocking key words in video titles or channel names but I much prefer "Channel Blocker" for blocking channels. It puts an X in front of the channel name on each video. Clicking the X blocks the entire channel and its video instantly disappear from whatever page you're on.

[lupusreal]

Blocktube let's you blacklist channels and videos like that, the buttons for it are placed in the "..." menu beside each video.