title: Firebase web push notification in iframe is only working in firefox
body: <p>I am using firebase for web push notification it is working perfect when I used it in same domain, but I have only one ssl domain and many non ssl website. So I have plan to use it in iframe and integrate this facility in all my non ssl websites too.
  <br>
  <br>
  <strong>URL is</strong></p>
  
  <pre><code>https://htmlcodeplay.com/notification/notification/index.html?websiteid=3
  </code></pre>
  
  <p>I have integrate it through iframe like below<br></p>
  
  <pre><code>&lt;iframe src='https://htmlcodeplay.com/notification/notification/index.html?websiteid=3'&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>I have integrate this lines into my blogger <a href="https://allinworld99.blogspot.in" rel="nofollow noreferrer">https://allinworld99.blogspot.in</a>. But it is working perfectly in Firefox browser but not in chrome browser. No errors also displayed. <br><br>
  As per this link <a href="https://stackoverflow.com/questions/40298292/does-my-web-application-require-ssl-for-firebase-cloud-messaging-for-web-to-work">Does my web application require SSL for Firebase Cloud Messaging for Web to work?</a>. It should not work, but how it is working in firefox browser.</p>