Well, here I go sounding like a broken record.

This is not the place to discuss particular games and their errors as an end-user. In order to get help, you will need to contact the developer of Fusion Fall because this is a problem with their game (a game which must be a myriad of bugs, because we get posts erroneously made here about it sometimes three times a week!).

If your web player crashes when you play other games made in the Unity engine, then I'd be happy to try and help, but given the constant questions posted here about Fusion Fall, I feel comfortable assuming this is a problem on their end, not with the web player.