Flutter: Configure Web Firebase

<script src="https://www.gstatic.com/firebasejs/8.3.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.3.0/firebase-analytics.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.3.0/firebase-firestore.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.3.0/firebase-auth.js"></script>

<script>
  // Your web app's Firebase configuration
  // For Firebase JS SDK v7.20.0 and later, measurementId is optional
  var firebaseConfig = {
    apiKey: "AIzaSyBMrhRJqdZBjqgOMjw-2lcsiIAyA5na3VU",
    authDomain: "fir-project-e1016.firebaseapp.com",
    databaseURL: "https://fir-project-e1016-default-rtdb.firebaseio.com",
    projectId: "fir-project-e1016",
    storageBucket: "fir-project-e1016.appspot.com",
    messagingSenderId: "65139327059",
    appId: "1:65139327059:web:1a6472ddc7655c174d46a6",
    measurementId: "G-LH4D913KNT"
  };
  // Initialize Firebase

  firebase.initializeApp(firebaseConfig);
  firebase.analytics();
  firebase.firestore();
</script>