DeeCon

About

DeeCon helps you inspect the current tab’s HTTP request and response headers in a clean, readable popup.

It is useful for developers, security learners, bug bounty researchers, and QA testers who want quick visibility into how a website responds.

Features:

View request and response headers for the active tab
Analyze common security headers such as CSP, HSTS, X-Frame-Options, X-Content-Type-Options, and Referrer-Policy
See a simple security score based on detected headers
Detect common web technologies, libraries, frameworks, CMS platforms, analytics tools, CDNs, and servers
Identify possible header-based issues such as missing security headers, server version disclosure, weak cookie flags, and CORS misconfiguration hints
Search through captured headers and findings
Copy individual headers or all headers
Export a PDF report
Light and dark theme support
DeeCon processes inspected data locally in your browser. It does not send captured headers or page technology signals to an external server.