(Debug builds only) Open DOM Inspector on the XUL document of the current window.

im/content/debug/debug.js

@@ -21,7 +21,7 @@ var debug = {
   },
 
   inspector: function debug_inspector() {
-    inspectDOMDocument();
+    inspectDOMDocument(document);
   },
 
   garbageCollect: function debug_garbageCollect() {