Collusion is an experimental add-on introduced by Firefox. It provides an interactive, real-time visualization of the entities that track your behavior across the web. Many services like Google rely on user data to provide relevant content and enhance your online experience but most tracking happens without users’ consent and without their knowledge.
Collusion also allows you to see all the third parties that are tracking your movements across the Web. If you want to be tracked, Collusion will be a powerful tool to help you do that.