Modify Header Value

Name: Modify Header Value
Rating: 3.6212 (66 reviews)
Author: Milen

By: Milen

Add, modify or remove a header for any request on desired domains.

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Features & Capabilities

Modify Header Value is a versatile Chrome extension that allows you to add, modify, or remove HTTP request headers for any request on specified domains. This makes it an invaluable tool for app developers, website designers, and testers who need to experiment with or debug HTTP headers.

Key features include easy toggling via the toolbar icon, managing multiple header items with options to activate or deactivate them independently, and a detailed tutorial on adding custom headers. It supports complete control over requests to enhance your development and testing workflows. For comprehensive information on HTTP headers, it directs users to Wikipedia's HTTP Header Fields list. Bug reports can be submitted via the extension's homepage, ensuring continuous improvement and support.

User Growth & Download Statistics

Add-on Developer Tools Programming

By:

Milen

Daily users:

10,758 51

Rating:

3.62

(66)

Version:

0.2.0 Last updated: 2025-04-10

Version code:

5923982

Creation date:

2015-07-06

Risk:

Permissions:

Host permissions:

<all_urls>

Size:

98.36KB

Email:

mi*****@yandex.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-15

Compare stats and ranking:

Ranking

# 739 ▲ 4

Other rankings

#64 in Web Development ▲ 1

#104 in Appearance ▲ 1

#164 in Privacy & Security ▲ 1

#1 in modheader keyword 35

#1 in modify keyword 37

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Other platforms

Modify Header Value (HTTP Headers) (v0.2.1)

40,000 3.40

(50)

Modify Header Value (HTTP Headers) (v0.2.0)

9,617 3.00

(4)

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:

Milen

Firefox Add-ons Store

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

Email:

mi*****@yandex.com

Website:

https://mybrowseraddon.com/modify-header-value.html

Permission Change History

2025-04-10: Version 0.1.8 → 0.2.0

Add Host permissions: <all_urls>

Add Permissions: declarativeNetRequest

Remove Permissions: <all_urls> webRequest webRequestBlocking

User Reviews

Summary: Users generally value the core ability to add and tweak HTTP headers in the browser and view it as a useful tool, sometimes as a strong alternative to similar extensions. However, many reviews note reliability problems (headers may not be applied or only affect the first request), a confusing UI, breakage after updates (including MV3 changes), and that it doesn’t affect client-side XHR/fetch requests. Some sites can break when altering headers (e.g., YouTube). Overall, it’s helpful when working, but stability and scope issues limit its consistency.

Pros

Core feature: enables adding and adjusting HTTP header values in browser requests.
Useful for testing and security scenarios; described as very useful by a security researcher.
Provides a good alternative to similar extensions (e.g., Requestly).
Gives flexibility to tweak any header you desire.

Cons

Unreliable header changes: changes may not apply consistently and often affect only the first request.
Update-induced breakage: updates can break the add-on or limit its functionality (e.g., MV3 changes).
UI/UX unclear: enable/disable state isn't clearly indicated.
Does not affect client-side XHR/fetch requests.
Can cause site breakages (e.g., YouTube) when modifying certain headers.

Recent reviews

Not working

by S.*****, 2026-04-13

Can't change existing header after adding it. Even when you add a new header, it is not reliably added. I wish the old ModHeader extension was still available.

by No*****, 2026-03-18

by Fi*****, 2025-08-10

View all user reviews ›

Is Modify Header Value 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.

Modify Header Value requires a few sensitive permissions. 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.

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.

Modify Header Value has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

Medium This extension has medium user count. Unpopular extensions may not be stable or safe.
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