What does HeaderMod do?

HeaderMod focuses on modifying browser HTTP headers for testing, debugging, privacy, or web development. It is catalogued under Browser DevTools & extensions on PulseGate.

Who should use HeaderMod?

HeaderMod is an open-source project built for web developers and browser testers.

Yes — HeaderMod is open source under the Open Source license and free to use.

What platforms does HeaderMod run on?

HeaderMod runs on the web, embeddable surfaces, macOS, Windows, and Linux.

Is HeaderMod still active?

Unverified. HeaderMod has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to HeaderMod?

Similar projects tracked by PulseGate include ModHeader, Request Header Modifier, and Modify HTTP Headers.

Who develops HeaderMod?

HeaderMod is developed by UtilsFactory.

When did HeaderMod launch?

HeaderMod first shipped in 2025.

Back to the index

HeaderMod

Name: HeaderMod
Author: UtilsFactory

github.comBrowser DevTools & extensions

HeaderMod is an open-source Firefox extension for changing HTTP request and response headers in the browser. It is intended for developers and testers who need to inspect or modify header behavior while working with websites and web applications.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit github.com

Overview

4 features

HeaderMod sits in PulseGate's Browser DevTools & extensions category. It focuses on modifying browser HTTP headers for testing, debugging, privacy, or web development. HeaderMod is an open-source project aimed at web developers and browser testers. The project is open source (Open Source). It ships for the web, embeddable surfaces, macOS, Windows, and Linux.

UtilsFactory builds and maintains HeaderMod, and it first shipped in 2025. Key capabilities include request headers, response headers, and header rules.

Summary written by a language model from the project’s public pages.

Request headers
Response headers
Header rules
Firefox integration

Built with & integrations

Runs on

BrowserEmbeddablemacOSWindowsLinux

Trust & compliance

License

Open Source

Verified signals

HTTPSPrivacy Policy Terms of ServiceOpen SourceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed10 Sep · 09:13 UTC
HeaderMod verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about HeaderMod

What does HeaderMod do?: HeaderMod focuses on modifying browser HTTP headers for testing, debugging, privacy, or web development. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use HeaderMod?: HeaderMod is an open-source project built for web developers and browser testers.
Is HeaderMod free?: Yes — HeaderMod is open source under the Open Source license and free to use.
What platforms does HeaderMod run on?: HeaderMod runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is HeaderMod still active?: Unverified. HeaderMod has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to HeaderMod?: Similar projects tracked by PulseGate include ModHeader, Request Header Modifier, and Modify HTTP Headers.ModHeader Request Header Modifier Modify HTTP Headers
Who develops HeaderMod?: HeaderMod is developed by UtilsFactory.
When did HeaderMod launch?: HeaderMod first shipped in 2025.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: web developers and browser testers
Model: Open source
Solves: Modifying browser HTTP headers for testing, debugging, privacy, or web development.

Registered as

Firefox Add-ons: headermod

Developer

UtilsFactory

Index record

Indexed: 10 Sep 2026
Lifecycle: Alive
Last seen: 10 Sep 2026

Identity audit (13)

Slug: headermod-github-com
Lifecycle state recorded: 10 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 10 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Written by a language model from the project's public pages.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 10 Sep 2026
Canonical URL: https://github.com/UtilsFactory/HeaderMod

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