Go to console.firebase.google.com → Add project → give it any name → skip Google Analytics. Then in the project: Build → Firestore Database → Create database → Start in test mode → pick any location. Then: Build → Authentication → Get started → under "Sign-in method" enable Email/Password → Save. (You'll use this to log in after connecting below.) Then: Project settings (gear icon) → scroll to "Your apps" → click the "</>" web icon → register the app → on the SDK setup screen, click the "Config" option (not "npm" or "CDN") → copy the whole firebaseConfig object shown.