context: function AddMessageComposeOfflineObserver(){  var observerService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);  observerService.addObserver(messageComposeOfflineObserver, "network:offline-status-changed", false);    gIsOffline = gIOService.offline;  // set the initial state of the send button  MessageComposeOfflineStateChanged(gIsOffline);}
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