Use the extension to see why your privacy is in danger.

Lightbeam is a Firefox browser extension that uses interactive visualizations to show you the relationships between third parties and the sites you visit.

People who use a browser without any extensions often don’t have a clue what’s going on while they are browsing through the web. They don’t know that these websites are contacting other servers for additional ressources, tracking etc.

Lightbeam can show them that many websites make requests to the same third party and that some third parties - like Google - are present on the majority of all websites. This leads to the insight that those third parties know which websites you are visiting. What they do with this knowlegde - or data - is a different thing.