Fantastic. I use multiple ad and tracker blockers but I feel this one has some great features that work well and is easy to use. 5/5 for now from me. I also use and suggest Ghostery, MinerBlock, NoScript (can get annoying especially if you're not technical but has saved my @$$ from some bad bad virus's by blocking websites / Scripts. And lastly I pay for Malwarebytes and use the extension/add-on for it as well although its almost the same as Ghostery in most ways.

All in all, this is probably my favorite. Keep up the updates, especially the anti-adblock feature! SO Killer! :D