HTTP Header Spy

Name: HTTP Header Spy
Rating: 4.8 (5 reviews)
Author: Michiel Roos

HTTP Header Spy enables you to inspect request- response headers and cookies right after page load with no extra clicks.

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Features & Capabilities

HTTP Header Spy is a powerful Chrome extension that empowers web developers and analysts to instantly inspect HTTP request and response headers alongside cookies right after the page loads, eliminating the need to open any developer tools.

With features like automatic hiding of information panels, detailed response time metrics, server IP display, full redirect path tracking, and support for XHR and sub-frame requests, this tool streamlines header inspection. Users can also select from light or dark themes, filter and highlight headers, and position the viewing panel in any corner of the browser window. HTTP Header Spy makes it easy to analyze form data, GET parameters, cookies, and security features such as HSTS with colorful visual status indicators, enhancing productivity and ease of debugging.

User Growth & Download Statistics

Add-on Developer Tools Privacy & Security

By:

Daily users:

Rating:

Version:

2.0.49 Last updated: 2020-01-09

Version code:

4937667

Creation date:

2020-01-09

Risk:

Permissions:

http://*/*
https://*/*
tabs
activeTab
storage
webRequest

Content scripts matches:

Size:

594.43KB

Email:

mi*****@michielroos.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-17

Compare stats and ranking:

Ranking

# 7,281 ▲ 28

Other rankings

#5 in ad spy keyword 23 ▼ 1

#14 in header keyword 41

#57 in response keyword 15

#142 in lead keyword 23 ▲ 2

#171 in reader keyword 71 ▼ 2

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Other platforms

HTTP Header Spy (v2.0.49)

7,000 3.84

(61)

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:

Michiel Roos

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/http-header-spy/

Email:

mi*****@michielroos.com

Website:

https://github.com/Tuurlijk/HTTP-Header-Spy

User Reviews

by 全民*****, 2025-04-08

by 远离*****, 2025-02-22

by ge*****, 2024-06-08

View all user reviews ›

Is HTTP Header Spy 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.

HTTP Header Spy 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.

HTTP Header Spy 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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