Worked well on firefox for youtube but since last last week and after days of not updating it to block Youtube. I must say this ad blocker is no longer useful on Firefox for Youtube. Uninstalling and reinstalling does nothing, there are no updates to run. It was a 5 star add-on but now I give 2 due to working well in the past. If it's updated to block youtube then I will update rating but as it stands useless if you use mainly youtube. Also it cannot block Twitch adds either. Dropping back to 1 star.