simple-modify-headers

Name: simple-modify-headers
Rating: 4.6389 (36 reviews)
Author: Didierfred

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

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Features & Capabilities

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.

User Growth & Download Statistics

Add-on

By:

Daily users:

Rating:

Version:

1.9.0 Last updated: 2024-07-14

Version code:

5775251

Creation date:

2018-01-09

Risk:

Permissions:

Size:

148.30KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 1,028 ▲ 11

Other rankings

#110 in Web Development ▲ 1

#154 in Other extensions ▲ 4

#2 in modheader keyword 35

#2 in modify keyword 37

#12 in header keyword 27

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Other platforms

simple-modify-headers (v1.9.0)

20,000 4.35

(23)

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Didierfred

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/simple-modify-header/

Website:

https://github.com/didierfred/SimpleModifyHeaders/tree/v1.8.1

User Reviews

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.

Recent reviews

Top e não tem anúncios

by Fi*****, 2026-03-18

by fe*****, 2025-10-24

Permet d'ajouter un header Authorization Bearer facilement

by Ju*****, 2025-10-02

View all user reviews ›

Is simple-modify-headers Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

simple-modify-headers requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

simple-modify-headers has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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