Want to play a MOG (multiplayer online game) passively while surfing the web all day? Then you’ll like PMOG, the first game developed by California and UK-based GameLayers.
PMOG, which is currently in private beta with 150 or so users, is a Firefox add-on that lets you interact with other users asynchronously on websites you visit. In some ways it is like Stumbleupon - users can create “missions” which are groups of websites under a theme (one is called “Laugh, Hard” and is a group of humor sites; another is called “Tech News Tour” and includes links to Engadget, Gizmodo, Digg and Slashdot). When you go on a mission a controller appears in the bottom right of your screen, letting you move from site to site.Link
"Sounds interesting, almost like an after-thought game..the game for players who don't want to be distracted from surfing the net!"