Collusion is an experimental add-on for Firefox that allows you to see which sites are using third-party cookies to track your movements across the Web. It shows, in real time, how that data creates a spider-web of interaction between companies and other trackers.
If you don't see the Collusion icon in the bottom right corner of your browser, make sure the add-on bar is shown. On Windows, click the Firefox menu button, then click Options, then check "Add-on Bar". On Mac, go to the View menu, then the Toolbars menu, then check "Add-on Bar".
We're working on adding more features, such as being able to upload an anonymized version of your Collusion data so we can build a big picture view of the tracker ecosystem. We're also working on visualizing other methods of tracking besides third-party cookies and improving the visualizations generally. Find us on Github.
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