# HTTP Header Mangler

> HTTP Header Mangler inserts HTTP headers on a per host basis.

Canonical page: [https://chrome-stats.com/d/http-header-mangler](https://chrome-stats.com/d/http-header-mangler)

## Overview

- **ID:** `http-header-mangler`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Peter Nilsson
- **Category:** web-development,privacy-security
- **Daily users:** 127
- **Weekly downloads:** 2
- **Rating:** 4.22 / 5 (9 ratings)
- **Version:** 1.1.4resigned1
- **Last updated:** 2024-04-25
- **First published:** 2014-04-04
- **Size:** 11 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/http-header-mangler/)
- **Website:** [https://github.com/disptr/httpheadermangler](https://github.com/disptr/httpheadermangler)

## Description

HTTP Header Mangler is a powerful Chrome extension that allows users to insert HTTP headers selectively on a per-host basis. Users can define rules using simple strings or regular expressions to target specific hosts, making it highly customizable for advanced HTTP header manipulation.

With support for multiple headers per rule and the ability to delete headers by assigning empty values, HTTP Header Mangler offers fine-grained control over the HTTP requests your browser sends. It's particularly useful for developers and testers who need to modify headers dynamically. The extension is open-source and maintained on GitHub for transparency and contributions.

## Rankings

- #10,300 — Overall
- #17 — header
- #40 — insert
- #141 — manga
- #234 — example
- #244 — reader

## Permissions and access

### Permissions

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

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Low 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 has low user count. Unpopular extensions 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).

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- [User-Agent Header Manager](https://chrome-stats.com/d/user-agent-header-manager) — 1 users
- [Headers Middleman](https://chrome-stats.com/d/chrome-headers-middleman) — 10 users, 3.00 / 5
- [Header Override](https://chrome-stats.com/d/headeroverride) — 7 users
- [OpenHeader](https://chrome-stats.com/d/openheader) — 1 users
- [Custom Header Injector](https://chrome-stats.com/d/custom-header-injector) — 1 users
- [Simple Modify Headers - Extended](https://chrome-stats.com/d/simple-modify-headers-extended) — 300 users, 5.00 / 5

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