find firebug XUL window

Question

I want to get handle of firebug XUL window, and do some operations such as toggle, reopen, close and issue these actions from main window, using javascript.

I hope my question is clear enough to understand. Where firebug.xul definition starts like this:

<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
        id="firebug"
        title="Firebug"
        width="800" height="600"
        persist="screenX,screenY,width,height,sizemode">