rem: iid.equals(Components.interfaces.nsISupportsWeakReference)) 
add: iid.equals(Components.interfaces.nsISupportsWeakReference) || iid.equals(Components.interfaces.nsISupports)) 
context:   QueryInterface : function(iid)  {    if (iid.equals(Components.interfaces.nsIWebProgressListener) ||         iid.equals(Components.interfaces.nsISupportsWeakReference))      return this;    throw Components.results.NS_NOINTERFACE;  }
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