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Header Editor

Release Chrome Web Store Mozilla Addons license Discussions Build Status

An extension which can modify the request, include request headers, response headers, redirect requests, and cancel requests.

It's 100% FREE, no ADs, no data collection.

For more documentations, Please visit

Get this extension

Firefox Logo Mozilla Add-on.

Chrome Logo Chrome Web Store.

Edge Logo Edge Add-ons.

Firefox Logo Install our self-distributed version.

About Permissions

Header Editor require those permissions:

  • tabs: Open links (such as the options page) or switch to a tab

  • webRequest, webRequestBlocking, _all_urls_: Modify requests

  • storage, unlimitedStorage: Storage rules and settings

  • unsafe-eval: Execute custom function, code at src/share/core/rule-utils.ts#L8 (may change in the future, you can search for the newest location by new Function)


Contribute codes: Submitting a pull request

Thanks to them for their contribution: YFdyh000 iNaru


English: Please submit a issue or pull request for file locale/original/messages.json

Other language: Please translate them on Transifex

Please note that some languages (such as zh-Hans) will not be translated on transifex because the browser does not support them, click here to view full list

How to build


  • Install node (14+) and pnpm.

  • Clone this project, or download the source code and extract it.

  • Run pnpm i.

  • Run npm run build

  • Find build result at /dist


  • Run npm run start

  • Open browser, load extension from /dist directory or /dist/manifest.json


Copyright © 2017-2023 FirefoxBar Team

Open source licensed under GPLv2.