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Used to work quite well on nearly every site you'd visit. Unfortunately, now it doesn't block ANYTHING on most of the big name sites that PAY THEM to NOT block ad's or annoyances on many sites! Even when you set it to strict blocking, I still see ads and B.S. EVERYWHERE! So I'd say this add n is now USELESS!

I didn't know how important this add-on was until Mozilla had a certificate problem with Firefox and they would not work. All the ads were popping up and they are extremely annoying.