HeaderTweaker

HeaderTweaker is a browser extension for adding, changing, and removing HTTP request headers. Create header rules, enable or disable them, and optionally limit them to matching URL patterns.

Features

• Add, edit, enable, disable, and delete request-header rules.
• Match rules to URL patterns when needed.
• Import and export configuration as JSON.
• Enable or disable all header modifications from the settings panel.
• Firefox support through webRequest and Chrome support through declarativeNetRequest.

All configuration is stored locally in the browser.

Development

Requirements: Node.js 20+ and pnpm 10+.

pnpm install
pnpm build:firefox
pnpm build:chrome

The builds are written to dist/firefox/ and dist/chrome/. To run a development build in a browser:

pnpm dev:firefox
pnpm dev:chrome

Useful checks:

pnpm check-types
pnpm lint
pnpm test

License

MIT