SpritesMind.Net

http://nesbox.com/

I play some games the quality is perfect !!!

A full genesis emulator online written in flash !

I tried contra and already the first level was broken (BG didn't scroll as it should). Then I tried Adventures of Batman and robin and the emulation didn't support Shadow/Highlight at all + Some of the music wouldn't play at all.

So like one would expect from an online emulator, the quality is far from perfect...