No Simulator ? Help ? Anyone?

So I am reading through the developer documentation and it all makes good sense.

However if I try to load a device type in the simulator as suggested for the zwave switch then I pick the location and I pick the virtual device and…

Nothing, absolutely nothing, visible on the right of the page where I believe the simulator should presumably appear. Just whitespace. I am using firefox.

Is this broken ? or am I doing domething wrong ?