Surrender focus when closing url pop up

[Qwyntex]

A bit similar to #35 as in it would solve that issue as well. It makes intuitive sense for the url bar to lose its focus when closing out of the pop up.

I know that in Firefox it is difficult to make the searchbar surrender focus using extensions but as far as I know you also can't detect clicking on it, so maybe there is a nice way in the zen-browser

Really cool project, hope you consider my request!