DNS / domain based blockers are entirely too coarse in my experience. There are plenty of cases where an ad or a tracking script comes from the exact same domai

DNS / domain based blockers are entirely too coarse in my experience. There are plenty of cases where an ad or a tracking script comes from the exact same domain as real content. A real ad blocking extension can match only parts of the URL, or block certain file types, etc. Ad blocking extensions can also do CSS to clean up the page after blocking the ad, or "display: none" ads that for some reason can't be blocked any other way.