🚀 Professional HTTP Header Editor for Chrome & Firefox 🚀
Completely free alternative to paid header modification tools
🔥 100% FREE - No subscriptions, no premium features, no limitations
🎯 Unlimited Profiles - Create as many header configurations as you need
⚡ Real-time Header Modification - Instant application of request and response headers via the declarativeNetRequest API
🎨 Professional Dark UI - Clean, modern interface designed for developers
☑️ Individual Header Controls - Enable/disable each header independently
📋 Copy to Another Profile - Per-row dropdown to copy a header into another profile's matching section
🎯 Profile Filters - Scope a profile to specific domains, or to a Chrome tab group so headers never leak outside it
🌐 7 Languages - English, 简体中文, 繁體中文, 日本語, 한국어, Русский and Español, switchable from the toolbar (spot a bad translation?)
🔄 Drag & Drop Reordering - Reorganize headers by dragging them
⏸️ Pause Functionality - Temporarily disable without losing configurations
🔒 Privacy Focused - All data stored locally, no tracking or analytics
Built for web developers, QA testers and anyone debugging API auth flows, CORS or environment-specific behaviour.
- Chrome: Chrome Web Store → "Add to Chrome"
- Firefox: Firefox Add-ons → "Add to Firefox"
- From source: see docs/development.md
| Guide | What's in it |
|---|---|
| Usage | Profiles, headers, filters, toolbar, permissions |
| Development | Project structure, local setup, build, releases |
| i18n | How translations work, in the extension and on the site |
| Gotchas | Hard-won bugs and undocumented behaviour |
| Feature | Header Editor Pro - Free | Other Extensions |
|---|---|---|
| Price | 🟢 Completely Free | 🔴 $5-15/month subscriptions |
| Profiles | 🟢 Unlimited | 🔴 3 profiles max (free tier) |
| UI Quality | 🟢 Professional dark theme | 🔴 Basic/outdated interfaces |
| Privacy | 🟢 No tracking/analytics | 🔴 Often collect usage data |
| Open Source | 🟢 Full transparency | 🔴 Proprietary/closed source |
No data collection, no analytics, no external servers. Every configuration stays in local storage on your device, and the code is open for you to check. Full privacy policy.
This extension costs nothing, and nobody pays me to maintain it or to build new things into it. It gets better in my own time.
Want something improved? Open an issue and let's talk it through — that's free too, and it's the best way in.
Chip in and your request moves up my queue. And if you'd rather not, no hard feelings — nobody ever turned down a glass of water ;)
Either way, it stays free for everyone. Starring the repo and sharing it with other developers helps just as much.
- Website: testacode.github.io/header-editor-pro-free
- Issues: GitHub Issues
- License: MIT
Made with ❤️ for the developer community