Best I know of now. Rated 5 out of 5 stars

I used to use Fakir which was available through a geocities page that was deleted with all the rest. This seems to actually be better than Fakir although I think a more powerful AI will be needed soon to provide what is needed as far as privacy is concerned, would like better control on adding some of the search terms as well as deleting what I don't like, but this is far better than nothing at all. Remember this type of program not only helps protect your privacy but helps invalidate all user results for everyone online, and so is a start toward a new level of privacy than has existed up to now!

This review is for a previous version of the add-on (0.6.721).