# HeaderMod

> Modify request and response headers per profile, with URL and resource filters, tab lock, pause, and cloud backup.

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

## Overview

- **ID:** `headermod-app`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** ibaciu6
- **Category:** web-development,privacy-security
- **Daily users:** 17
- **Weekly downloads:** 10
- **Version:** 1.0.0
- **Last updated:** 2026-07-24
- **First published:** 2026-07-21
- **Size:** 172 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/headermod-app/)
- **Website:** [https://github.com/ibaciu6/headermod](https://github.com/ibaciu6/headermod)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/headermod-app/privacy/](https://addons.mozilla.org/firefox/addon/headermod-app/privacy/)

## Description

HeaderMod lets you modify HTTP request and response headers using rules you define.

Features:
- Multiple named profiles of request/response header rules
- Per-rule enable/disable
- URL filters (regex) and resource-type filters
- Tab lock — apply a profile only to the active tab
- Pause / resume all rules without deleting them
- Cloud backup — timestamped profile snapshots via browser sync
- Import / export profiles as JSON

Built on Manifest V3 declarativeNetRequest. HeaderMod collects no data and makes no network requests of its own. Host access is optional — grant it once from the popup ("Enable on all sites") and rules apply only to the sites you allow.

## Rankings

- #26,616 — Overall
- #10 — modheader
- #45 — header
- #140 — response
- #164 — pause
- #203 — modify

## Permissions and access

### Permissions

- `contextMenus`
- `storage`
- `tabs`
- `declarativeNetRequest`

## Safety

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

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- 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).

## Similar extensions and apps

- [ModHeader](https://chrome-stats.com/d/modheader-firefox) — 19,864 users, 3.37 / 5
- [HeaderMod](https://chrome-stats.com/d/headermod) — 303 users
- [ModHeader By GreatJIN](https://chrome-stats.com/d/modheader-by-greatjin) — 27 users
- [xHeader - Modify HTTP headers](https://chrome-stats.com/d/xheader) — 2 users
- [Header Override](https://chrome-stats.com/d/header-override) — 39 users
- [Header Override](https://chrome-stats.com/d/headeroverride) — 7 users
- [Configurable Header Manager](https://chrome-stats.com/d/configurable-header-manager) — 2 users
- [HeaderForge](https://chrome-stats.com/d/headerforge) — 7 users
- [Header Ext](https://chrome-stats.com/d/header-ext) — 3 users
- [DevHeaders - HTTP Header Editor & Modifier](https://chrome-stats.com/d/devheaders) — 2 users
- [HeadForge](https://chrome-stats.com/d/headforge) — 1 users
- [HeaderSmith – cod3rjava](https://chrome-stats.com/d/headersmith-cod3rjava) — 1 users

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