Registering for progress callbacks

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Registering for progress callbacks This fragment registers your nsIWebProgressListener interface so you receive status/progress related callbacks.

  // include pertinent embedding interfaces
  #include "nsIWebProgressListener.h"
  ...
  rv = webBrowser->AddWebBrowserListener(
      NS_STATIC_CAST(nsIWebProgressListener*, this),
      NS_GET_IID(nsIWebProgressListener));
  if (NS_FAILED(rv)) return rv;