Rated 5 out of 5 stars

AWESOME! Thank you very much for creating this add-on. I use it to show the Bookmark Manager window. Here's the code:

window.open("chrome://browser/content/places/places.xul", "ac","resizable=yes,height=800, width=800,top=100,left=100")

Edit this 1 line with any of the .xul links found on this page to create some very useful buttons:
http://superuser.com/questions/392471/firefox-chrome-document-urls

This review is for a previous version of the add-on (0.0.5.5).