Sentinel Shield v3.0

Secure password management with local and Firestore storage.
2FA support with TOTP generation.
Protection against XSS, CSRF, and fingerprinting.
Autofill and credential saving via content scripts.
Firefox-compatible Manifest V3 with fixed JSON syntax.
Desktop-only; Android not supported due to Firefox mobile limitations.

Sentinel Shield v2.0:
- Improved stability.
- Enhanced TOTP generation and credential sync.
- Bug fixes and performance updates.