# simple-modify-headers

> The extension rewrite the header (request or response) based on a rules table. It 's possible to add, modify or remove header fields for a choosen url pattern. It's possible to import/export the configuration

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

## Overview

- **ID:** `simple-modify-header`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Didierfred
- **Category:** web-development,other
- **Daily users:** 6,024
- **Weekly downloads:** 167
- **Rating:** 4.62 / 5 (37 ratings)
- **Version:** 1.9.0
- **Last updated:** 2024-07-14
- **First published:** 2018-01-09
- **Size:** 148 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/simple-modify-header/)
- **Website:** [https://github.com/didierfred/SimpleModifyHeaders/tree/v1.8.1](https://github.com/didierfred/SimpleModifyHeaders/tree/v1.8.1)

## Description

**Simple Modify Headers** is a powerful Chrome extension designed to rewrite HTTP(S) request and response headers with ease. Using a customizable rules table, users can add, modify, or delete headers selectively based on URL patterns. The extension supports exporting your configuration to a JSON file and importing from files—including compatibility with the widely-used ModifyHeaders plugin format.

This open-source tool, licensed under the Mozilla Public License 2.0, empowers developers and testers to control HTTP headers efficiently, enhancing debugging, privacy, and functionality testing. For more information and source code access, visit the [GitHub repository](https://github.com/didierfred/SimpleModifyHeaders/tree/v1.8.1).

## Rankings

- #1,052 — Overall
- #107 — Web Development
- #149 — Other extensions
- #2 — modify
- #3 — modheader
- #12 — header

## Permissions and access

### Permissions

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

## Safety

- **Risk impact:** High 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).

## Review summary

Users generally find simple-modify-headers easy to use and effective for adding custom request headers, with several reviews highlighting its lightweight, no-frills design and lack of ads. It’s praised for a straightforward workflow to insert headers quickly. However, several limitations recur: it does not handle response headers (only request headers), and it offers limited URL manipulation—you can’t easily edit URL parts or apply complex URL rules. Some sites/URLs don’t work (e.g., localhost/127.0.0.1:8080; Chrome Web Store). DevTools headers may appear raw, which can mislead whether changes are applied. Managing blocked sites is not intuitive, and a status indicator would help.

### Pros

- Simple and easy to use.
- Works for adding request headers.
- No ads.
- Lightweight/minimal UI.

### Cons

- Does not support response headers; only request headers.
- Limited URL manipulation; cannot edit URL parts or apply complex URL rules.
- Doesn't work for some sites/URLs (e.g., localhost 127.0.0.1:8080, Chrome Web Store).
- Headers shown in DevTools may appear raw/unmodified, which can mislead whether changes are applied.
- Hard to manage blocked sites; adding sites to block is not intuitive; lacks a straightforward status indicator.

## Similar extensions and apps

- [Simple Modify Headers - Extended](https://chrome-stats.com/d/simple-modify-headers-extended) — 303 users, 5.00 / 5
- [HeaderMod](https://chrome-stats.com/d/headermod) — 303 users
- [HTTP Headers Customize](https://chrome-stats.com/d/http-headers-customize) — 2 users
- [Configurable Header Manager](https://chrome-stats.com/d/configurable-header-manager) — 2 users
- [simple-modify-headers-lk](https://chrome-stats.com/d/simple-modify-headers-lk) — 2 users
- [OpenHeader](https://chrome-stats.com/d/openheader) — 1 users
- [HTTP Header Plugin](https://chrome-stats.com/d/http-header-plugin) — 6 users
- [Modify HTTP Headers](https://chrome-stats.com/d/modify-http-headers) — 50 users, 5.00 / 5
- [Header Ext](https://chrome-stats.com/d/header-ext) — 3 users
- [ModHeader By GreatJIN](https://chrome-stats.com/d/modheader-by-greatjin) — 27 users
- [Modify Header Value](https://chrome-stats.com/d/modify-header-value) — 9,880 users, 3.62 / 5
- [Header Editor](https://chrome-stats.com/d/header-editor) — 12,124 users, 4.71 / 5

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