As Firebase Authentication does not natively support roles, you need to store user roles separately. The best approach is to use Firestore or Realtime Database to manage user roles.

• Maintain a users collection in Firestore with each user's uid, email, and role.
• Fetch the user’s role from Firestore when they log in and store it in the app state.
• Use a route guard (a wrapper component) to allow access based on roles.
• Create an admin panel where an admin can update user roles.

Check this documentation for more information.