Rated 5 out of 5 stars

Highly recommended add-on, which makes tracking visible,easily (on major sites like google) avoidable, and which now also features mouse-click antitracking and a white list.Works well together with other essential security related add-ons like noscript, ghostery and requestpolicy. You have to go to the add-on's homepage to get the latest version which is compatible with FF4.