What this service does is analyze which URLs are fetched from the sites you visit and compare them with a list of known tracker URLs. It doesn't need to care fo

What this service does is analyze which URLs are fetched from the sites you visit and compare them with a list of known tracker URLs. It doesn't need to care for flash cookies or such, it's there to inform you of who's on a page potentially tracking you. It raises your awareness so you can properly act on it. Another plugin that existed for a while is Ghostery: http://www.ghostery.com/ http://www.ghostery.com/ this one also blocks the fetch of the URL so whatever cookies they might be using becomes irrelevant. Most of these tracking pixels are not flash anyway so blocking flash won't accomplish anything. Blocking Javascript will do something of course but some are only images so it will still be pointless and you'll still be tracked. The reality IMHO is that it's better to be targeted by relevant ads than to see dating/scammy ads everywhere.