A good AddOn - but does not work (any more?). Tested this AddOn with Chrome and it works beautiful, but I can´t get it to work with firefox. Maybe there is a sort of update oder UI-Change inside YT, or this AddOn is not compatible with some other AddOns, but 1. It does not block any channels I manually added 2. When I rightclick on a thumb and choose "block Channel" the channel does not appear on the Video Blocker List and nothing happens. I love using FF, so it would be great if there is a workaround