Changes

this.registered = false;

}

PluginWatcherObserver.prototype = {

observe: function(subject, topic, data) {

// --YOUR CODE GOES HERE--

}

},

//Takes care of registering the observer services for the "experimental-notify-plugin-call" topic

.getService(Components.interfaces.nsIObserverService);

observerService.removeObserver(this, "experimental-notify-plugin-call");

}

}

}