queryinterface - Getting the current inner window ID in a Firefox 32 extension -

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I'm trying to maintain a Firefox extension and it depends on getting the existing internal Window ID. Window 31 has a query interface in Window object: 

  element / foo.js: Foo.prototype = {window: tap, ... init: function (aWindow) {this.window = XPCNativeWrapper .unwrap (aWindow); Var util = this.window.QueryInterface (Ci.nsIInterfaceRequestor) .get interface (Ci.nsIDOMWindowUtils); Dump ('your internal window id is:' + util.currentInnerWindowID + '\ n'); }, ... shutdown: function () {}}   
 window in firefox 32 The JQuery interface object has disappeared and I wonder how to get the current internal window id.  
 Thank you.   
 
 
 Calling XPCnetwrapper.unwrap removes the query interface from a window.  
  if (aWindow.QueryInterface) {util = XPCNativeWrapper.unwrap (aWindow.QueryInterface (Ci.nsIInterfaceRequestor) .get interface (Ci.nsIDOMWindowUtils)); Dump ('your internal window id is:' + util.currentInnerWindowID + '\ n'); }

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