security-best-practices

Apply least privilege by minimizing Chrome extension permissions and host_permissions to the narrowest scope necessary for functionality. This reduces the attack surface and prevents data leakage by ensuring the extension only accesses required resources.

Prevent XSS in content scripts by implementing safe DOM manipulation, proper data sanitization, and safe URL handling. These secure-coding patterns ensure dynamically inserted content cannot execute malicious scripts within the extension's privileged context.

Yes, this guidance explicitly supports MV3 by configuring MV3 CSP rules, managing permission strategies, and securing content scripts. It provides structured configuration guidelines tailored for real-world Manifest V3 extension scenarios.

Audit Chrome extension security during CI by running structured security checks and performing regular reviews. This enforces safe-coding patterns and static reviews to catch permission bloat, insecure messaging, and vulnerable DOM interactions early.

Avoid storing secrets client-side to prevent data leakage and unauthorized access. Secure storage and data protection strategies require encrypting sensitive data, ensuring that extension vulnerabilities do not expose user secrets directly.