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

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

Visit he.firefoxcn.net for more documentations.

Browser	Lite	Full
Firefox	Official Download or Mozilla Add-ons	Official Download or Mozilla Add-ons
Chrome	Chrome Web Store	Install full version
Edge	None	Edge Addons

• The official download is exactly the same as Mozilla Add-ons, but the Mozilla Add-ons review is very slow, usually taking more than a week, and you may not be able to get the latest version.
• HeaderEditor-xxx-v2 is full version, HeaderEditor-xxx-v3 is lite version.
• Diff between lite and full version

Header Editor require those permissions:

• tabs: Open links (such as the options page)

• webRequest, webRequestBlocking, declarativeNetRequest, *://*/*: Modify requests

• storage, unlimitedStorage: Storage rules and settings

• debugger: Modify response body in Chrome

• unsafe-eval: Execute custom function, code at src/share/core/rule-utils.ts#L41 (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 to 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, view full list.

• Install Node.js 20.x and pnpm 10.x.
• Clone this project, or download the source code and extract it.
• Run pnpm i --frozen-lockfile.
• Run build command
  • For chrome full version, run npm run build:chrome_v2
  • For chrome lite version, run npm run build:chrome_v3
  • For firefox full version, run npm run build:firefox_v2
  • For firefox lite version, run npm run build:firefox_v3
• Find build result at /dist_*

• Modify start command's TARGET_BROWSER to the version you want to build

• Run npm run start

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

Copyright © 2017-2025 FirefoxBar Team

This project is licensed under the ​GNU GPL v2.0 or later.

CDN acceleration and security protection for this project are sponsored by Tencent EdgeOne.