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How to add header value for firebase realtime database js file?

I am having an issue with my site regarding Firebase Realtime Database and Cross Origin Resource Policy. My site already has The Cross Origin Resource Policy header configured and is being served on every asset in my site (js, css, html, etc). But now the js script from firebase.io is being blocked because it doesn't have this header.
I would like to ask, how do I add these headers? Where in the Firebase console should I go to?
Here is the piece of code where the issue is triggered. Basically I initialize the Server object then call changeDb, then call checkAuthor (Where the issue occurs):
window.Server = function () {
const config = {
apiKey: FirebaseApiKey,
authDomain: FirebaseAuthDomain,
projectId: FirebaseProjectId,
storageBucket: FirebaseStorageBucket,
messagingSenderId: FirebaseMessagingSenderId,
appId: FirebaseAppId,
databaseURL: FirebaseDatabaseUrl
};
firebase.initializeApp(config);
};
Server.prototype.changeDb = function (prefix) {
this.annotationsRef = firebase.database().ref().child(prefix + '/annotations');
this.authorsRef = firebase.database().ref().child(prefix + '/authors');
}
Server.prototype.checkAuthor = function (authorId, openReturningAuthorPopup, openNewAuthorPopup) {
this.authorsRef.once('value', authors => { //<== Here is where it is triggered
if (authors.hasChild(authorId)) {
this.authorsRef.child(authorId).once('value', author => {
openReturningAuthorPopup(author.val().authorName);
});
} else {
openNewAuthorPopup();
}
});
};

TypeError: firebase.firestore () is not a function web javascript

I am trying to upload an image on firebase cloud storage with web javascript. I am getting "firebase.firestore () is not a function" on my console. Am I going any wrong way?
I have done insert and fetch data on firebase database. But I have to stop for upload image on firebase cloud storage.
<script src="https://www.gstatic.com/firebasejs/6.2.3/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/6.2.3/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/3.1.0/firebase-database.js"></script>
<script src="https://www.gstatic.com/firebasejs/6.3.0/firebase-firestore.js"></script>
var firebaseConfig = {
apiKey: "XXX",
authDomain: "XXX",
databaseURL: "XXX",
projectId: "XXX",
storageBucket: "XXX",
messagingSenderId: "XXX",
appId: "XXX"
};
// Initialize Firebase
var defaultProject = firebase.initializeApp (firebaseConfig);
// Get a reference to the database service
var fileName = selectedFile.name;
var storageRef = firebase.firestore ().ref ('image' + fileName).put (selectedFile);

updating node on the computer seemed to have fixed the issue. I updated it to v16.15.1

change
firebase.firestore ().ref ('image' + fileName).put (selectedFile);
to
firebase.storage().ref('image' + fileName).put (selectedFile);

I receive: firebase.database is not a function error when trying to connect my form to the database

I'm trying to connect my contact form to a firebase database and i keep getting the firebase.database is not a function error continuously.
I'm also using parcel-bundler for this project and also getting these errors:
at Object.parcelRequire.firebase.js (firebase.js:44)
at newRequire (firebase.js:44)
at firebase.js:44
at firebase.js:44
I really don't know what I'm doing wrong, after looking at similar problems none of them could provide a solution.
This is how I am linking my files:
<script src="https://www.gstatic.com/firebasejs/6.0.2/firebase-app.js"></script>
<script src="./firebase.js"></script>
<script src="./main.js"></script>
</body>
This is the code from my firebase.js file:
// Your web app's Firebase configuration
var firebaseConfig = {
apiKey: "AIzaS*************r48uEU",
authDomain: "k********irebaseapp.com",
databaseURL: "https://*******irebaseio.com",
projectId: "k******",
storageBucket: "k**********m",
messagingSenderId: "984****903",
appId: "1:9843179**********3734705af"
};
// Initialize Firebase
firebase.initializeApp(firebaseConfig);
var messageRef = firebase.database().ref("messages");
//grab a form
document.querySelector(".contact-form").addEventListener("submit", submitForm);
function submitForm(e) {
e.preventDefault();
// get values
var name = getInputVal("name");
var email = getInputVal("email");
var number = getInputVal("phone");
var message = getInputVal("message");
saveMessage(name, email, number, message);
}
function getInputVal(id) {
return document.getElementById(id).value;
}
function saveMessage(name, email, number, message) {
var newMessageRef = messageRef.push();
newMessageRef.set({
name: name,
email: email,
number: number,
message: message
});
}
Any help will be deeply appreciated, thanks guys.

You're currently only including this for Firebase:
<script src="https://www.gstatic.com/firebasejs/6.0.2/firebase-app.js"></script>
This only contains the definition of FirebaseApp, and doesn't include Firebase Authentication (firebase.auth()) or Firebase Realtime Database (firebase.database()). To include those, be sure to include the correct scripts for that too:
<script src="https://www.gstatic.com/firebasejs/6.0.2/firebase-auth.js"></script>
<script src="https://www.gstatic.com/firebasejs/6.0.2/firebase-database.js"></script>

Getting an Error on console while saving data in firebase firestore

here is my Javascript code. its simply copy from the firebase Docs
<script src="https://www.gstatic.com/firebasejs/5.4.2/firebase.js"/></script>
<script src="https://www.gstatic.com/firebasejs/5.3.0/firebase-firestore.js"></script>
<script>
// Initialize Firebase
var config = {
apiKey: ".",
authDomain: ".",
databaseURL: ".",
projectId: ".",
storageBucket: ".",
messagingSenderId: ".[enter image description here][1]"
};
firebase.initializeApp(config);
// Initialize Cloud Firestore through Firebase
var db = firebase.firestore();
function submitCountry(){
console.log('in funtion');
db.collection("cities").doc("asdasLA").set({
name: "Los Angeles",
state: "CasdasA",
stasdaate: "CasdasdasA",
stasaasddaate: "CAasd",
country: "USA"
})
.then(function() {
console.log("Document successfully written!");
})
.catch(function(error) {
console.error("Error writing document: ", error);
});
}
</script>
when i refresh my page it show the uncaught error.
{code: "app/duplicate-service", message: "Firebase: Firebase service
named 'firestore' already registered (app/duplicate-service).", name:
"firestore", stack: "firestore: Firebase: Firebase service named
'fires…m/firebasejs/5.3.0/firebase-firestore.js:1:326255"} firebase #
index.esm.js:17591 (anonymous) # index.esm.js:41 index.esm.js:17591
Uncaught Error: Cannot instantiate firebase-firestore - be sure to
load firebase-app.js first.
after clicking my save button it shows the error mention below.
when i use the same code on simple project without any JS or Bootstrap it works fine but same code i placed in My real project with Bootstrap it shows errors
[Intervention] Slow network is detected. See for more details.
Fallback font will be used while loading:

By doing
<script src="https://www.gstatic.com/firebasejs/5.4.2/firebase.js"/></script>
<script src="https://www.gstatic.com/firebasejs/5.3.0/firebase-firestore.js"></script>
you load the 'firestore' Firebase service twice, see the doc: https://firebase.google.com/docs/web/setup
You should either do
<script src="https://www.gstatic.com/firebasejs/5.4.2/firebase.js"></script>
or
<!-- Firebase App is always required and must be first -->
<script src="https://www.gstatic.com/firebasejs/5.4.2/firebase-app.js"></script>
<!-- Add additional services that you want to use -->
<script src="https://www.gstatic.com/firebasejs/5.4.2/firebase-firestore.js"></script>
Also note that in your code you have mixed versions (i.e. 5.4.2 and 5.3.0). Most probably something to avoid.
Following your comment below, in order to check that it writes correctly to the db, modify you code as follows and just open the HTML page (the set() method will be triggered automatically)
<script src="https://www.gstatic.com/firebasejs/5.4.2/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.4.2/firebase-firestore.js"></script>
<script>
// Initialize Firebase
var config = {
apiKey: ".",
authDomain: ".",
databaseURL: ".",
projectId: ".",
storageBucket: ".",
messagingSenderId: ".[enter image description here][1]"
};
firebase.initializeApp(config);
// Initialize Cloud Firestore through Firebase
var db = firebase.firestore();
db.collection("cities").doc("asdasLA").set({
name: "Los Angeles",
state: "CasdasA",
stasdaate: "CasdasdasA",
stasaasddaate: "CAasd",
country: "USA"
})
.then(function() {
console.log("Document successfully written!");
})
.catch(function(error) {
console.error("Error writing document: ", error);
});
}
</script>

Show Firebase data as Json in browser Console

I need help to show my data from my Firebase database as JSON to browser console log. I want load only Product into browser console. I found a code for pushing data from this link. Can anyone help me figure out the function please?
var firebase = require('firebase');
//var admin = require('firebase-admin');
firebase.initializeApp({
apiKey: "...",
authDomain: "xxx.firebaseapp.com",
databaseURL: "https://xxx.firebaseio.com",
projectId: "xxx",
storageBucket: "xxx.appspot.com",
messagingSenderId: "xxx"
})
var ref = firebase.database().ref('Product');
//it's child directory
var messageRef = ref.child('/');
/*messageRef.push
({
prdName: 'node1',
prdCategory: 'node1',
prdSup: 'node1',
prdDescription: 'node1',
prdImage: 'test1.jpg',
prdUrl: 'https://firebasestorage.googleapis.com/v0/b/ng-product.appspot.com/o/Uploads%2Ftest1.jpg?alt=media&token=f105332a-02c8-46ca-a639-745eda0e118c'
})*/
console.log('Product');

To get data from Firebase, you attach a listener. To then print it to the browser console, you call console.log() in the callback:
var ref = firebase.database().ref('Product');
ref.once('value', function(snapshot) {
console.log(snapshot.val());
});
I highly recommend that you send some time reading the Firebase Database documentation, and take the corresponding codelab. A few hours spent in those will save many more hours down the line.