A new Firefox extension called Collusion allows users to visualize trackers as they browse the web. A lot of sites contain a form of a tracker that can follow and record your browsing habits. Most trackers are harmless, but some of them do collect your personal data and track your online behavior for advertising purposes. Collusion updates its chart in real-time so the more websites you visit, the more dots appear on the page to indicate that a tracker is following you.
Collusion was developed by Atul Varma, an in-house engineer at Firefox. Ryan Merkley, COO at Mozilla, explains that:
When people try Collusion for the first time, they are often shocked or surprised at the large web of trackers that appear. It creates an immediate and visceral reaction after visiting only a few sites. People realize that they have very little control over where their data is going; it’s disheartening.