Detect focus on browser address bar?

No, it is not possible

why not check when the desired element has lost focus? and work your way from there? and what i meant was using the .focusout() event, instead of .blur() since it behaves different.

http://api.jquery.com/focusout/

You can only work with the DOM.

If you want to access address bar, you need a control running in the browser or your own toolbar.