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Header Editor Pro – Modify HTTP Headers

5.0(

4 ratings

)
ExtensionDeveloper Tools4,000 users
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Overview

Modify HTTP request and response headers. Unlimited profiles, domain and tab group filters, 7 languages. Free and open source.

Header Editor Pro is a free, open source HTTP header editor for developers. Add, modify or remove request and response headers, with no account, no telemetry and no limits. WHAT IT DOES • Request and response headers — set or append, each one individually toggleable • Unlimited profiles — no three-profile ceiling • Domain filters — scope a profile to the domains you choose • Tab group filters — keep sandbox headers inside their tab group, so staging headers never reach production tabs • Concurrent profiles — different tab groups can carry different headers at the same time • Pause everything with one click, without losing your configuration • Import and export profiles as JSON • 7 languages: English, Español, 日本語, 한국어, Русский, 简体中文, 繁體中文 TYPICAL USES • API testing — send Authorization: Bearer <token> to authenticated endpoints • CORS debugging — add Access-Control-Allow-Origin to reproduce and diagnose • Environment switching — X-Environment: staging against a different backend • Device testing — change User-Agent to compare mobile and desktop responses PRIVACY No data collection, no analytics, no telemetry, no external servers. Your configurations live in local browser storage and never leave your machine. Header rules are applied by the browser itself through the declarativeNetRequest API — the extension does not read page content, and never sees the requests it modifies. The full source is on GitHub under the MIT licence. Read it, audit it, fork it. FREE, AND NOBODY PAYS FOR IT No paywall, no "pro" tier, no nag screens. Nobody funds this work. If you want something improved, open an issue on GitHub and let's talk it through. Source code: https://github.com/testacode/header-editor-pro-free Privacy policy: https://testacode.github.io/header-editor-pro-free/privacy.html

5 out of 54 ratings

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Details

  • Version
    2.6.2
  • Updated
    September 5, 2026
  • Offered by
    IndioSolariMobil
  • Size
    64.12KiB
  • Languages
    7 languages
  • Developer
    Email
    bastadespammers@gmail.com
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

Manage extensions and learn how they're being used in your organization
The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

Support

For help with questions, suggestions, or problems, visit the developer's support site

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