I'm looking at the source code, and I'm not seeing what you're talking about. The code is only in content.js, and nothing is being talked to as far as I see. How is he sending out tracking data?
Edit: I'm sorry guys, I guess the file that the install button links to is not the addon itself like the Firefox addon site does, so saving it does not give you the addon. I'm retarded. He does not have tracking cookies, I apologize.