# ModHeader By GreatJIN

> Modify, remove, and inspect HTTP request headers with local profile-based rules using blocking webRequest.

Canonical page: [https://chrome-stats.com/d/modheader-by-greatjin](https://chrome-stats.com/d/modheader-by-greatjin)

## Overview

- **ID:** `modheader-by-greatjin`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Byungsoo JIN
- **Category:** web-development,privacy-security
- **Daily users:** 25
- **Weekly downloads:** 2
- **Version:** 0.1.18
- **Last updated:** 2026-06-09
- **First published:** 2026-06-05
- **Size:** 232 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/modheader-by-greatjin/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/modheader-by-greatjin/privacy/](https://addons.mozilla.org/firefox/addon/modheader-by-greatjin/privacy/)

## Description

ModHeader By GreatJIN is a personal header modification tool for testing and debugging HTTP request behavior.

It lets users create local profiles and rules to set, append, or remove request headers for matching URLs. It includes diagnostics for checking which rules match a target URL and inspecting request
  header behavior during development.

This add-on stores rules locally and does not transmit collected data to external services.

## Rankings

- #22,153 — Overall
- #13 — modheader

## Permissions and access

### Permissions

- `alarms`
- `storage`
- `webRequest`
- `webRequestBlocking`

### Host permissions

- `<all_urls>`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High 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 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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Source: [Chrome-Stats](https://chrome-stats.com/d/modheader-by-greatjin)