# Simple Modify Headers - Extended

> Rewrites HTTP request/response headers based on a rules table.

Canonical page: [https://chrome-stats.com/d/simple-modify-headers-extended](https://chrome-stats.com/d/simple-modify-headers-extended)

## Overview

- **ID:** `simple-modify-headers-extended`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Warren Bank
- **Category:** web-development
- **Daily users:** 300
- **Weekly downloads:** 5
- **Rating:** 5.00 / 5 (3 ratings)
- **Version:** 6.6.0
- **Last updated:** 2026-04-20
- **First published:** 2024-09-15
- **Size:** 119 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/simple-modify-headers-extended/)
- **Website:** [https://github.com/warren-bank/crx-simple-modify-headers/issues](https://github.com/warren-bank/crx-simple-modify-headers/issues)

## Description

Simple Modify Headers - Extended is a powerful Chrome extension that lets you rewrite HTTP request and response headers based on customizable rules. Originally forked from the Firefox extension simple-modify-headers (version 1.6.7), this tool provides enhanced functionality for web developers, testers, and privacy-focused users who want precise control over their HTTP headers. Users can create and manage a rules table to tailor how headers are modified for various browsing needs. Detailed change logs and usage instructions are available in the extension's README documentation. This extension is ideal for customizing browsing behavior, testing server responses, and improving privacy and security by manipulating headers on the fly.

## Rankings

- #6,685 — Overall
- #7 — modify
- #8 — modheader
- #27 — header
- #47 — wa sender
- #60 — simple

## Permissions and access

### Permissions

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

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High 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 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/simple-modify-headers-extended)