Awesome Mod Header

Add or overwrite HTTP request and response headers on URLs you choose. Open source.

FEATURES • Add or overwrite request and response headers on URLs matching your patterns • Multiple URL patterns per rule — Enter or comma to add, * / ** wildcards • Per-header on/off toggle, solo button, and a note field • Duplicate a single header row or a whole rule in one click • Drag to reorder rules and header rows • Header name autocomplete, split by request and response • Export rules as JSON to back up or share, import by pasting • Follows your system light/dark theme • Applies instantly — no save button, no page reload of the popup needed • Rules keep working after browser restart, with no background process PRIVACY • All data stays in your browser (chrome.storage.local) • No collection, no transmission, no analytics, no remote code • The extension registers declarativeNetRequest rules that Chrome itself applies — it cannot read your requests, responses, or page content OPEN SOURCE • https://github.com/gmelon/awesome-mod-header • Provides fast and easy Header Modification.