Derek Zimmer has a blog post over at Private Internet Access about the Firefox extension Lightbeam and how it shows graphically in realtime the benefits of privacy [privateinternetaccess.com]. Lightbeam is a continuation of the visualization project, Collusion, which was introduced in 2012. The extension shows which sites your browser is interacting with including third party connections and shows the relation between them. It has several visualization modes and the ability to save the connection history to a file. He notes that it is very useful in seeing the relation of a page to the plethora of trackers, web libraries, cookies, and all kinds of outside parties trying to gather and sell your data which it pulls in.