now working from the C# side, and notes for index.html

Assets/FirebaseWebGL/FirebaseInit.cs

@@ -0,0 +1,62 @@
+using System.Collections;
+using System.Collections.Generic;
+using FirebaseWebGL.Database;
+using UnityEngine;
+
+namespace Netherlands3D.Twin
+{
+    public class FirebaseInit : MonoBehaviour
+    {
+        private void Start()
+        {
+            Debug.Log("GETTING FIREBASE DATA");
+            FirebaseDatabase.GetJSON("test/path", gameObject.name, "DisplayData", "DisplayError");
+        }
+
+        public void DisplayData(string data)
+        {            
+            Debug.Log("DISPLAYING FIREBASEDATA" + data);
+        }
+
+        public void DisplayError(string error)
+        {
+            Debug.Log("DISPLAYING FIREBASEERROR" + error);
+        }
+    }
+}
+
+////the following needs to be in the index.html:
+//////////////////////////////////////////////
+
+//< script src = "https://www.gstatic.com/firebasejs/8.8.0/firebase.js" ></ script >
+//< script > 
+
+//const firebaseConfig = {
+//  apiKey: "AIzaSyDlYdgMb-zINsNixTdfrLGmqxiOCIZ95E8",
+//  authDomain: "kerst2024-6c596.firebaseapp.com",
+//  databaseURL: "https://kerst2024-6c596-default-rtdb.europe-west1.firebasedatabase.app",
+//  projectId: "kerst2024-6c596",  
+//  messagingSenderId: "839108749676",
+//  appId: "1:839108749676:web:26ab8b6a2775b683c0eb49"
+//};
+
+//firebase.initializeApp(firebaseConfig);
+//</ script >
+
+
+////then find the script.onload function and add the window instance and the firebase instance and change it to:
+///////////////////////////////////////////////
+
+//script.onload = () => {
+//    createUnityInstance(canvas, config, (progress) => {
+//        progressBarFull.style.width = 100 * progress + "%";
+//    }).then((instance) => {
+//        unityInstance = instance;
+//        window.unityInstance = instance;
+//        this.firebase = firebase;
+//        loadingBar.style.display = "none";
+//        loadingBar.remove();
+//    }).catch((message) => {
+//        alert(message);
+//    });
+//};