Unity WebPlayer Plugin Keeps Crashing

[UberGod]

Hello. I use Mozilla Firefox. I want to play UberStrike, a game made by Unity. So, I downloaded the Unity Web Player. The Unity WebPlayer Plugin came in the Firefox add-on manager as well. But, when I went to load the game, a message came which said:

"The Unity Player Plugin has crashed"

I have also added a screenshot of it in the attachment.

Please tell me what I can do to make sure that the plugin does not crash. I use Unity Player 3.4.27374 Plugin. I'd appreciate your help sincerely.

Regards,

UberGod