Phosphor

Phosphor is a first-person shooter created with Macromedia Director. The Shockwave Player allows the game to run within a web browser on Windows and Mac OS computers. Both single player (with AI-controlled bots) and multiplayer (using peer-to-peer Internet or LAN connections) game modes are supported. Our goal is to create a gaming experience similar to classic FPS games…

Phosphor is a Shockwave FPS game. In default mode you play against three computer generated bots in a simple setting and try to stay alive. It won’t give Valve any sleepless nights, but it’s Shockwave for goodness sake. Running in your browser. Beware the crashing Firefox on exit syndrome though. Oh and it’s got multi-player support built in too.
http://www2.rasterwerks.com/game/phosphor/beta1.asp