HeaderQuarters

Command your headers. Nothing leaves HQ. Privacy-focused HTTP header modification for Chromium browsers.

HeaderQuarters — Command your headers. Nothing leaves HQ. HeaderQuarters is a privacy-focused HTTP header modification extension for Chromium browsers. Built on Manifest V3 and the declarativeNetRequest API, it gives developers and power users full control over HTTP request and response headers — without compromising privacy. 🔒 PRIVACY GUARANTEE • Zero network calls — the extension never contacts any external server • Zero analytics or telemetry — we don't track you, period • All data stored locally in chrome.storage.local • Sensitive header values (Authorization, Cookies, API keys) are masked by default in the UI • Open source under the Apache-2.0 license ⚡ QUICK ADD Add headers in seconds right from the popup. HeaderQuarters auto-detects the domain of your current tab so you can create rules instantly — no need to open the full settings page. 📁 PROFILE MANAGEMENT Organize your header rules into named profiles. Toggle profiles on or off, duplicate them, drag to reorder, search across them, and import/export for backup or sharing. 📋 BUILT-IN TEMPLATES Get started fast with 8 pre-built templates for common tasks: • Akamai Debug Headers • Disable Cache (Cache-Control) • CORS Allow All • Security Headers (CSP, HSTS, X-Frame-Options) • Authorization Bearer Token • Custom User-Agent • Accept-Language Override • API Key Header Create your own reusable custom templates too. 🔐 PER-TAB CONTROL Apply profiles to specific browser tabs only. Per-tab rules auto-clean when the tab closes — full control, zero leakage. ✏️ INLINE EDITING Made a typo? Edit any quick rule in-place with a single click. No need to delete and re-create. 🎯 PRECISE MATCH CONDITIONS Target rules exactly where you need them: • Specific domains and subdomains • Wildcard and regex URL patterns • Resource types (XHR, Script, Image, WebSocket, etc.) • Request or response direction • Set, remove, or append operations • Configurable rule priority ⌨️ KEYBOARD SHORTCUTS Power users can configure shortcuts for: • Open the popup (Alt+H / Ctrl+H on Mac) • Toggle master switch (Alt+Shift+H / Ctrl+Shift+H on Mac) • Jump to Quick Add (Alt+Shift+A / Ctrl+Shift+A on Mac) 🌍 MULTI-LANGUAGE Available in English, Spanish, French, German, and Japanese. Automatically adapts to your browser language. 🎨 THEMES Toggle between dark, light, or system-matched themes. Choose whether the Profiles tab or Quick Add tab opens by default. 📦 IMPORT & EXPORT Back up your profiles or share them with teammates. Exported files are plain JSON — no proprietary formats. USE CASES • Debug CDN caching with Akamai/Cloudflare debug headers • Test CORS configurations during API development • Inject authorization tokens for testing authenticated endpoints • Override User-Agent for cross-browser testing • Set custom headers for feature flags and A/B testing • Disable browser caching during development PERMISSIONS HeaderQuarters follows the principle of least privilege: • storage — saves your profiles and settings locally • declarativeNetRequest — the modern, secure API for header modification • activeTab — reads the current tab URL so the popup can show relevant context • optional host permissions — Chrome manages access transparently based on your rules No background processes. No remote code. No surprises.