Straight from the mouths of the dev: "If user consent is given, this add-on will collect non-personalized browsing history. In that case, the user's browsing history can be accessed by a third party. But we don't collect cookies, password, e-mails or any other confidential info. Only the domains (not full URLs) of the web-sites visited and nothing else."
Mmmmm, no man, that's not ok with me.