Works as of 23 Dec 23. Youtube is actually usable again with this add-on. I have been avoiding Youtube intentionally for a good while now, only viewing it when I have to. Finally able to block all the useless, annoying and offensive channels! Thank you! Please don't let this become obsolete. With Youtube monetizing and locking down everything so you no longer have any choices, it is desperately needed and IMHO, an essential add-on for any and all Firefox users.