This feature does not sound promising to privacy minded users. I understand that Mozilla needs money to operate but this will drive away a lot of people. Most a

This feature does not sound promising to privacy minded users. I understand that Mozilla needs money to operate but this will drive away a lot of people. Most average users won't mind this kind of behavior though. A simple pop-up once you update/install Firefox saying something like "Would you like to turn on interest based tiles?" should do the trick. Either that or a separate build of Firefox (dev edition?). I'm a strong opponent when it comes to sharing more then needed. Sharing my browser history and behavior with a 3rd/2nd party is sharing way more then necessary.