Collusion is a Firefox Add-on that lets you visually monitor how companies are tracking your browsing habits. If you’re not using Firefox or don’t have the plugin installed, you can still go to the Collusion page to learn through the demo of an interactive, real-time visualization of entities that track your behavior across the web.
By installing the plugin, you’ll be able to see the graph (similar to the demo…see pic) change in real-time based on the sites you visit on your browser.
Now that you are aware that companies are tracking your every move online, and you now know how they are doing it, you might want to put a stop to it. If you do, you can simply download and install another Firefox plugin called Trackerblock. The plugin is available for Firefox and Internet Explorer only. If you’re using Chrome, you might want to go look for an alternative.