title: Firebase messaging is not supported in your browser how to solve this?
body: <p>I am using firebase messaging for web push notification with react. But browser show this message</p>
  
  <blockquote>
    <p>Messaging: This browser doesn't support the API's required to use the firebase SDK. (messaging/unsupported-browser)</p>
  </blockquote>
  
  <p>This is code :</p>
  
  <pre><code>const initializedFirebaseApp = firebase.initializeApp({
    apiKey: "XXXXXX",
    authDomain: "XXXXXXX",
    databaseURL: "XXXXXXXXX",
    projectId: "XXXXXX",
    storageBucket: "XXXX",
    messagingSenderId: "XXXXXX",
    appId: "XXXXXX"
  });
  
  if (firebase.messaging.isSupported()) {
      let messaging = initializedFirebaseApp.messaging();
  }
  </code></pre>
  
  <p><code>firebase.messaging.isSupported()</code> is always returning the false. Is there any way I should proceed?</p>
  
  <p>Version for react : 16.8.2 and firebase version : 6.0.2</p>