RetroGames.cc - Play retro games online in your browser
Play retro games from NES, SNES, GB, GBC, GBA, SEGA Genesis and Classic Arcade Games in your browser.

Best one only I found so far.
Yeah, web based emulators these days are crazy.I will need to check that one too. Thanks to advancements in technology, it is becoming harder and harder to play my old favorites. The newer PCs and software is becoming less compatible by the day and requiring more and more effort to keep them running. I hope that using the online versions will bypass most of these issues.