FormGenie stores user data locally in the browser using Chrome/Firefox extension storage APIs. Form fields, aliases, and denylist entries remain on the user's device and are not transmitted to any external server by the extension.

Data handling summary:
- What is stored: Field keys, values, aliases, and user preferences.
- Where it is stored: Local browser storage (sync storage).
- External communications: None. The extension does not enhance or track user activity.