From PC World: Mozilla's advertising experiment for the new tab page in Firefox is popping up in the nightly test builds of the browser. Called Directory Tiles, the new program mixes website suggestions from sponsors and sites based on your browsing history in the new tab page for Firefox, and the mere hint of advertising in Firefox has created a fierce backlash from many of the browser's devotees.
Sponsored Tiles are only meant to appear if you don't have a browsing history, as typically the new tab page shows the sites you visit most often.
The Directory Tiles layout isn't vastly different from what you see now in the current version of Firefox. There's a grid of tiles with links to websites on them.
The biggest difference is that you may see several tiles that are paid placements. Each ad tile has a sponsored label beneath it indicating that money changed hands for that tile to be there. These are called Sponsored Tiles, as explained on Mozilla's support page.
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