just checked it for you, it works fine for me in IE8, Firefox 3.5.7 and Firefox 3.6
However at first in chrome 4.0.249 the screen appeared black for me, (just like it did for you) but it worked fine once I chose to use the ffdshow codec instead of the systems default video codec. Note that I have extra video codecs installed so it might be why its working fine for me and not for you in firefox.
However this is not a problem with the PS3 Eye Driver.
Im sure there are lots more site available like this if you just need a quick way of taking pitcures with your camera.
Regards,
Alan