Privacyfix

Call me paranoid, but where and how is Privacyfix storing its data? Is there a guarantee that it never calls "home"? Or is this just an ingenious meta-tracker at the browser level, that, if widely deployed, will be used to hijack the advertisement parts of web pages and replace them with its own (advertising) content?

Yes, I have read their homepage and some statements to the effect that data won't leave the browser. But it shares IP number, and, while not having any license I recognize, it re-uses the wording from the GPL about fitness for a purpose. So if it is not fit for its purpose and leaks data, will you know, and will you be allowed to do anything about it?