While the new tab page on Firefox is usually reserved for your most visited sites, Mozilla is planning to introduce promotional tiles into that page. But first they will do so with those who cleared their history or those who are installing Firefox for the first time. The company guarantees they will label the tiles properly. As TechCrunch points out, this could be a trial to see how users will respond to the addition of ads into their space and could eventually be rolled out in a way that all new tab pages will feature some sort of sponsored link.