If the Unity Web Player is installed but not working in Chrome or Firefox on your Windows PC, then please read this article for the resolutions.

A zero-day vulnerability has been disclosed in the popular Unity Web Player browser plugin. The flaw allows an attacker crossdomain access to websites and services using the victim’s credentials.

Inside the Unity Web Player MCV Staff 5th November 2009 Development News Unity has often been touted as the most powerful game engine this side of a million dollars.