New ask Hacker News story: Ask HN: Does anyone know of a tool to see what data is sent to 3rd parties

Ask HN: Does anyone know of a tool to see what data is sent to 3rd parties
2 by oseibonsu | 1 comments on Hacker News.
I remember a tool from years ago that would analyze what data a website was sending to 3rd parties. Does anyone remember what it was called or know of something similar.