I made a small Unity2D experiment and whenever I close the tab in which the web player is running the browser crashes. It also happens when I try to change the URL of that tab. In other words, everytime I try to quit the web player chrome/Firefox crashes. Any idea why? 
Here’s the link to the web player
Anyone? I really need to solve this.
I saw the same problem on Chrome and Safari on a Mac, so there does seem to be some problem. Nothing was written into the log to give any insight into what is/isn’t happening, so I don’t know how to help you. Maybe try an empty project, see if that behaves the same way. Then add some spinning cubes or something, and see how that works out.