Have it installed for a few weeks now, it fails for many domains. If you click a link from example.com to example.org, it will already mark example.org as 'potentially tracking you on example.com' (because it sent the referer of example.com to example.org <i>once</i>).<p>Also it reports nearly every domain I visited in the past weeks to be tracked by lesswrong.com, which is rather impossible.<p>Lastly, it gets cluttered very fast. Not within 5 minutes, but a day later no user could make sense of it anymore. There should also be a clear overview with things like top domains (which would be Facebook for their Like button, Google ads and analytics, and probably more).