*NEXT_PUBLIC_FIREBASE_API_KEY=<your-api-key> NEXT_PUBLIC_FIREBASE_AUTH_DOMAIN=<your-auth-domain> NEXT_PUBLIC_FIREBASE_PROJECT_ID=<your-project-id> NEXT_PUBLIC_FIREBASE_STORAGE_BUCKET=<your-storage-bucket> NEXT_PUBLIC_FIREBASE_MESSAGING_SENDER_ID=<your-sender-id> NEXT_PUBLIC_FIREBASE_APP_ID=<your-firebase-app-id> Great, now we have all of our configuration values stored in Environment Variables - this means we don't expose our private configuration values to the public! * NEXT_PUBLIC means that you expose the values to public!