Doesn't work, at all.
Tried with @, and without, with space and with underscore. Nothing works. Channels I try to block still show up in searches, even after restarting firefox.

Fantastic. Thank you!

thank you my friend - works great!

You say: "The extension is really simple to use. Just type the name of the channel and forget about it (you can always bring it back if you want)."

Fixed: The red Finger was concealed.