Lightbeam was a Firefox browser extension that visualized the first- and third-party sites connected to pages you visited. It was designed for...
Pros
- Made third-party tracking relationships visible as an interactive graph
- Focused on investigation rather than only blocking requests
- Historically available as free, open-source software
Cons
- Discontinued and no longer maintained by Mozilla
- Unavailable through current mainstream browser extension stores
- Less effective for active tracker blocking than modern privacy extensions