Headers focuses on manipulating HTTP headers in Firefox without manually editing requests or responses. It is catalogued under Browser DevTools & extensions on PulseGate.

Headers is an open-source project built for web developers and security testers.

Does Headers have a free plan?

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

What platforms does Headers run on?

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

Is Headers still maintained?

Unverified. Headers 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 Headers?

Similar projects tracked by PulseGate include SimpleModifyHeaders, FlexHeaders, and FF Headers.

Headers is developed by Zygmunt Jakub.

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Headers

Name: Headers
Author: Zygmunt Jakub

github.comInfrastructure

Headers is an open-source Firefox browser add-on for inspecting and modifying HTTP headers. It is intended for developers and security testers who need to adjust request or response headers while browsing or debugging web applications.

Open SourceWebEmbeddablemacOSWindowsLinux

Visit github.com

Overview

4 features

Headers is a Browser DevTools & extensions project. It focuses on manipulating HTTP headers in Firefox without manually editing requests or responses. Headers is an open-source project aimed at web developers and security testers. Headers is open source under the Open Source license. Headers is available on the web, embeddable surfaces, macOS, Windows, and Linux.

It is developed by Zygmunt Jakub, and it first shipped in 2024. Among its 4 catalogued features are HTTP header editing, request manipulation, and response manipulation.

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

HTTP header editing
Request manipulation
Response manipulation
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

Indexed9 Sept · 16:23 UTC
Headers verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Headers

What is Headers?: Headers focuses on manipulating HTTP headers in Firefox without manually editing requests or responses. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Headers for?: Headers is an open-source project built for web developers and security testers.
Does Headers have a free plan?: Yes — Headers is open source under the Open Source license and free to use.
What platforms does Headers run on?: Headers runs on the web, embeddable surfaces, macOS, Windows, and Linux.
Is Headers still maintained?: Unverified. Headers 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 Headers?: Similar projects tracked by PulseGate include SimpleModifyHeaders, FlexHeaders, and FF Headers.SimpleModifyHeaders FlexHeaders FF Headers
Who makes Headers?: Headers is developed by Zygmunt Jakub.
How long has Headers been around?: Headers first shipped in 2024.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: web developers and security testers
Model: Open source
Solves: Manipulating HTTP headers in Firefox without manually editing requests or responses.

Registered as

Firefox Add-ons: headers

Developer

Zygmunt Jakub

Index record

Indexed: 9 Sept 2026
Lifecycle: Alive
Last seen: 9 Sept 2026

Identity audit (13)

Slug: headers-github-com
Lifecycle state recorded: 9 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 9 Sept 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: 9 Sept 2026
Canonical URL: https://github.com/ZygmuntJakub/Headers

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