Fantastic addon. The amount of trackers this blocks is amazing, although I do think a history of the amount of trackers blocked would be cool. I love being able to choose whether to completely block a third party, or just block cookies. My only complaint would be it doesn't always judge which sites to block very well. It doesn't block unnecessarily, the sites automatically blocked are usually accurate. But it doesn't always block all the the trackers. For example, the third party tracker New Relic doesn't seem to get automatically blocked even though tracking is New Relic's whole purpose. So if you use this, I recommend turning on "Show domains that don't appear to be tracking you" in general settings, and making sure there are no trackers on websites you visit. With all that said, this addon is amazing and it's one of my favorites.