View chrome source in Firefox

It would be extremely helpful for developing Firefox extensions if I could see the source of, e.g., chrome://browser/content/browser.xul with overlays applied. Is there a way to do thi开发者_C百科s? Chrome List and "View Source" show only the base structure, ChromeBug requires restarting the browser and isn't too easy to get working.

All you need is DOM Inspector, and I highly recommend pairing that with Inspect Context which adds an "Inspect" option to the right-click menu of almost everything, much like the "Inspect Element" option of Firebug.