HTTP Headers Inspector

HTTP Headers Inspector is a lightweight developer tool that shows HTTP request and response headers for every network request made by the current tab. Status Code on the Icon The extension icon dynamically changes to display the HTTP status code of the current page — 200, 301, 404, 500 and so on — with color coding so you can see the status at a glance without opening any panel. Green — 2xx (Success) Orange — 3xx (Redirect) Red — 4xx (Client Error) Purple — 5xx (Server Error) Redirect Chain Tracking Easily see the full redirect path from the original URL to the final destination. Each step in the chain shows the status code, Location header and full response headers. Perfect for debugging 301/302 redirects across domains. Request & Response Headers Expand any request to view both request and response headers. Headers are color-coded by category: Blue — Standard headers Green — Security headers (HSTS, CSP, X-Frame-Options, CORS) Orange — Cache headers (Cache-Control, ETag, Expires) Pink — Custom headers (X-, CF-) POST Body Inspection View the contents of POST, PUT, and PATCH requests: Form data displayed as key=value pairs JSON payloads automatically formatted with indentation File upload indicators Filter & Search Filter requests by type: Document, XHR, JS, CSS, Image, Font Search across URLs and header names/values Real-time counters for each category Export & Copy Copy All Headers — copies all filtered headers as plain text Export HTML — generates a beautiful standalone HTML report with the same dark theme, ready to share or archive Privacy First No external connections — all styles and fonts are built-in No data collection — everything stays in your browser No tracking — zero analytics or telemetry Works completely offline after installation Technical Details Manifest V3 compatible Minimal memory footprint — stores up to 200 requests per tab Automatically clears data on navigation Keyboard shortcut: Ctrl+F to focus search Perfect for web developers, QA engineers, SEO specialists and anyone who needs to quickly inspect HTTP headers, debug redirects or verify security headers.