I am currently following a tutorial on this link
I get the following error.
firebase.js:75 Uncaught Error: This domain is not authorized for OAuth operations for your Firebase project. Edit the list of authorized domains from the Firebase console.
Do I need to create a Authentication system first?
You need to go on Firebase Panel, activate the signup method (Email/Password in this case) and then add your domain on the list of authorized domains:
https://www.firebase.com/docs/web/guide/user-auth.html#section-configuring
来源：https://stackoverflow.com/questions/37671742/this-domain-is-not-authorized-when-using-firebase-authentication