You need a free Firebase database so codes work on any browser, any domain.
This takes 2 minutes. Do it once, works forever.
Step 1: Go to console.firebase.google.com → Create project (free) Step 2: Click "Realtime Database" → Create database → Start in test mode Step 3: Copy your database URL (looks like: https://your-app-default-rtdb.firebaseio.com) Step 4: Paste it below and click Save
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Firebase Connected — Works on ALL Browsers & Domains