Visualizing Behavior-Tracking Cookies With Firefox
An anonymous reader writes "Using Firefox, and a new (open source) add-on called Collusion, you can see for yourself just how extensive the third-party behavior-tracking system is. Simply leave the Collusion website open, browse the web for a bit, and then return to see that your favorite websites are letting at least four or five behavior tracking companies follow you around the web."
Google Analytics is the largest offender in this. There are others, but they have their fingers everywhere. Here on slashdot too.
Ghostery is another Firefox add-on that does much the same, except also supports blocking the cookies.