Users of the Mozilla Firefox browser may soon see advertisements when they open new tabs. Firefox will soon deliver what it calls Directory Tiles instead of blank tiles, and those Directory Tiles will feature pre-selected browsing suggestions. Some of these tile placements will be from the Mozilla ecosystem, some will be popular websites in a given geographic location, and some will be sponsored content from hand-picked partners, wrote Darren Herman, Mozillas vice president of content services, on the company blog.