text: // Import and configure the Firebase SDK
  // These scripts are made available when the app is served or deployed on Firebase Hosting
  // If you do not want to serve/host your project using Firebase Hosting see https://firebase.google.com/docs/web/setup
  importScripts('/__/firebase/4.1.3/firebase-app.js');
  importScripts('/__/firebase/4.1.3/firebase-messaging.js');
  importScripts('/__/firebase/init.js');
  
  firebase.messaging();
  