# HeaderNinja

> Add or override HTTP request headers on outgoing requests, with an optional URL filter per rule. No tracking, no data collection.

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

## Overview

- **ID:** `headerninja`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Asif Iqbal
- **Category:** web-development,privacy-security
- **Daily users:** 1
- **Version:** 1.0.0
- **Last updated:** 2026-08-11
- **First published:** 2026-08-08
- **Size:** 15 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/headerninja/)

## Description

HeaderNinja adds or overrides HTTP request headers on outgoing requests.

• Add any header name + value from a simple toolbar popup
• Optional per-rule URL filter — target one site or leave blank for all
• One master switch to enable/disable every rule at once
• Rules are saved locally and applied instantly

Built on Manifest V3 declarativeNetRequest. No tracking, no remote code, no data collection — everything stays in your browser. Handy for API testing, auth tokens, custom user-agents, and debugging.

## Rankings

- #100,177 — Overall
- #180 — override

## Permissions and access

### Permissions

- `declarativeNetRequest`
- `storage`

### Host permissions

- `<all_urls>`

## Safety

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

- [HTTP Header Plugin](https://chrome-stats.com/d/http-header-plugin) — 7 users
- [Header request Injector](https://chrome-stats.com/d/header-request-injector) — 3 users
- [Custom Header Tailor](https://chrome-stats.com/d/mozlla-custom-headers) — 2 users
- [HeaderMod](https://chrome-stats.com/d/headermod) — 303 users
- [HeaderForge](https://chrome-stats.com/d/headerforge) — 6 users
- [Header Override](https://chrome-stats.com/d/headeroverride) — 7 users
- [Modify HTTP Headers](https://chrome-stats.com/d/modify-http-headers) — 51 users, 5.00 / 5
- [HeaderMod](https://chrome-stats.com/d/headermod-app) — 17 users
- [ModHeader By GreatJIN](https://chrome-stats.com/d/modheader-by-greatjin) — 26 users
- [Header Override](https://chrome-stats.com/d/header-override) — 39 users
- [HeaderPilot](https://chrome-stats.com/d/headerpilot) — 1 users
- [Overhead — HTTP Header Editor](https://chrome-stats.com/d/overhead-http-header-editor) — 2 users, 5.00 / 5

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