title: Firebase Cloud Messaging on iOS
body: <p>I am trying to use Firebase Cloud Messaging on my iPhone 6 running iOS 11.4, when the web app tries to initialize FCM, the following message shows up</p>
  
  <p><code>FirebaseError: Messaging: This browser doesn't support the API's required to use the firebase SDK</code></p>
  
  <p>Device: iPhone 6<br>
  iOS version: 11.4<br>
  FCM JS SDK version: 5.0.4<br>
  Safari version: 11.0 (As seen form <code>navigator.appVersion</code>)<br>
  Chrome version: 67.0.3396.87</p>