Save User Specific Data In Your App - Appgyver And Firebase

Can you make a video user-specific data in web development using firebase?

Sir can you make a tutorial on how to shrink, obfuscate, and optimize the app in appgyver. Thank you so much in advance

Server Error
FirebaseError: Firebase: Firebase App named '[DEFAULT]' already exists with different options or config (app/duplicate-app).

Did you see your screen ? Impossible see anything