How do I enable web player emulation mode?

I keep reading about how you can test webplayer settings in the editor by enabling 'Web Player Emulation Mode' but cannot figure out how to enable it.

The documentation says it can be done here, but I can't find it:

Edit -> Project Settings -> Editor

I can see where you can choose the URL, but cannot see how to enable emulation mode.

Here's what I see:

alt text

My target build has been set to web player as far as I know.

I know I'm missing something obvious here...

Unless I'm mistaken, the emulation they're talking about is this security thing. In Build Settings you set Platform to Web, that's pretty much it.