Does a very good job at blocking ads though I have it in conjunction with uBlock Origin so they both simultaneously are hitting all the ads - though adblocker ultimate has a feature that uBlock Origin doesn't have -- You can block elements of a site, say if they have inbuilt ads that are from that site, you can block those ads - and each time you go to that site, those ads will be automatically blocked. uBlock Origin can technically do the same, but it's not permanent.