Comment 1 for bug 604963

It looks like closing the window is possible but the rules under which you can do it are complicated: basically it seems to be hard to use this if it was the original window that was opened. So perhaps we'll have to leave the user to close it, or perhaps a javascript expert can suggest a way around it.

Polling should at least make it easier to avoid getting the user to specifically press enter, which is probably the bigger problem.