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 he.firefoxcn.net

Mozilla Add-on.

Chrome Web Store.

Edge Add-ons.

Install our self-distributed version.

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

• Install node (18+) and pnpm.
• 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

Open source licensed under GPLv2.

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