ReHeader — Modify HTTP Headers

ReHeader lets you modify HTTP request and response headers, redirect URLs, and filter which requests get touched — all from a lightweight popup, with zero tracking or telemetry. Features: • Add, edit, or remove request and response headers per profile • Redirect requests matching a regex to a new URL, with capture group support • Filter which requests are affected by URL pattern, resource type, and more • Multiple named profiles you can toggle independently • Import and export your configuration as JSON • Pause all modifications instantly • Fully open source — inspect every line on GitHub ReHeader is a free, open-source alternative to ModHeader, built with Manifest V3's declarativeNetRequest API. No accounts, no analytics, no data collection.