Well i know many of you think this is a noob game, but i am really puzzled

for example,
fusionfall, quakelive, free realm is annouced to be BBG
but in fact they downloads up to 300mb contents to your computer behind your browser,

and some of the games, although you need to download client, but the client is only 2 or 3 mb. if we could call these BBG? You know, even some flash games nowadays are much bigger than this.

so, how to definit a Browser Based Game?

Hmm, in my opinion, Browser Based Game should be non-download, and need just a browser.

I agree also.