# HeaderTweaker

> Lightweight browser extension that lets you easily modify outgoing HTTP headers

Canonical page: [https://chrome-stats.com/d/headertweaker](https://chrome-stats.com/d/headertweaker)

## Overview

- **ID:** `headertweaker`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Maurice
- **Category:** web-development
- **Daily users:** 4
- **Version:** 1.3.1
- **Last updated:** 2026-08-14
- **First published:** 2025-08-29
- **Size:** 554 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/headertweaker/)
- **Website:** [https://github.com/mkappelhof/HeaderTweaker/](https://github.com/mkappelhof/HeaderTweaker/)

## Description

HeaderTweaker lets developers, testers and/or power‑users inject, modify, or remove headers to outgoing HTTP requests on the fly. Whether you need to test APIs that require special authentication tokens, run A/B tests, simulate different browsers or debug CORS issues, this lightweight extension gives you full control over the outgoing headers without touching server code.

## Rankings

- #48,540 — Overall
- #122 — header

## Permissions and access

### Permissions

- `storage`
- `webRequest`
- `webRequestBlocking`
- `scripting`
- `activeTab`
- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [Header Tool](https://chrome-stats.com/d/header-tool) — 23 users
- [FlexHeaders - Modify HTTP Headers](https://chrome-stats.com/d/flexheaders-alter-http-headers) — 451 users, 5.00 / 5
- [HeaderMod](https://chrome-stats.com/d/headermod) — 303 users
- [HeaderTools - Inject and Edit Request Headers](https://chrome-stats.com/d/headertools) — 108 users
- [Overhead — HTTP Header Editor](https://chrome-stats.com/d/overhead-http-header-editor) — 2 users, 5.00 / 5
- [Header Ext](https://chrome-stats.com/d/header-ext) — 3 users
- [Headers](https://chrome-stats.com/d/headers) — 520 users, 5.00 / 5
- [OpenHeader](https://chrome-stats.com/d/openheader) — 1 users
- [tweak: mock and modify HTTP requests](https://chrome-stats.com/d/tweak-extension) — 1,576 users, 4.14 / 5
- [DevHeaders - HTTP Header Editor & Modifier](https://chrome-stats.com/d/devheaders) — 2 users
- [Header Editor](https://chrome-stats.com/d/header-editor) — 12,124 users, 4.71 / 5
- [HeaderForge](https://chrome-stats.com/d/headerforge) — 7 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/headertweaker)