Silent Recon is a free Chrome extension designed to improve web security by identifying common vulnerabilities as users browse. This passive security scanner focuses on detecting misconfigurations such as CORS flaws, missing HTTP security headers, and exposed APIs, making it a valuable tool for security professionals. The extension runs automatically once enabled, allowing users to analyze web applications in real time without the need for manual scanning.

Key features include the detection of CORS misconfigurations, flagging of missing security headers like CSP and HSTS, and identification of API endpoints with passive JSON exposure. Users can toggle the scanning feature on or off and apply a domain filter to customize their experience. Silent Recon prioritizes user privacy by ensuring that all detection occurs locally without sending data to external servers.