User profiling at its worst Rated 1 out of 5 stars
While you use this add-on, or even when you have it installed and visit supported pages, browsing behaviour, including page flow, visits, clicks, IP address, your ISP, time-on-site and a whole lot more is collected. Profiling at its worst. It constitutes a major invasion of your privacy if you use this add-on.
(a propos, apparently Mozilla is planning to integrate this as "Simple Sharing" in future versions of Firefox... Meaning this kind of invasion of privacy will become "core browser functionality". Where are we going again?)