Behind the scenes, here is who I found tracking pages on I visit : Amazon Associates DoubleClick eXelate Google Analytics New Relic OpenX QuantCast ScroreCard Research Beacon VigLink Live Ramp "Ghostery" Add-on . Just like the popup blockers, this one stops page info from being transmitted back to the mother ships. BTW, what is nice about this is that it supports multiple browsers. I actually use 3 different browsers for different reasons (Safari, Chrome and Firefox) and they have plugins for all 3. I have found all web sites now load much faster.