Is there a way to play psone emulators online? I mean, as zsnes does for super nintendo.

And if not, why not?

Not that I know of WeaponLord.

Why not? My guess is because PS1 games are more sophisticated than Super Nintendo's. There is a 4 year gap between the consoles after all. Also, I'm pretty sure you need the PS1's BIOS to play PS1 games, which is impossible to do on a web browser.