Who should use FlexHeaders?

FlexHeaders is an open-source project built for web developers and QA engineers.

What platforms does FlexHeaders run on?

FlexHeaders runs on the web and embeddable surfaces.

Is FlexHeaders still maintained?

Unverified. FlexHeaders 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 are alternatives to FlexHeaders?

Similar projects tracked by PulseGate include Headers, FF Headers, and Mozilla Custom Headers.

Who develops FlexHeaders?

FlexHeaders is developed by harrisondeo.

How long has FlexHeaders been around?

FlexHeaders first shipped in 2024.

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FlexHeaders

Name: FlexHeaders
Author: harrisondeo

github.comBrowser DevTools & extensions

FlexHeaders is an open-source Chrome and Firefox extension for managing HTTP request and response headers. It helps developers and testers add, edit, or remove headers while inspecting browser-based web behavior.

Open SourceWebEmbeddable

Visit github.com

Overview

6 features

FlexHeaders sits in PulseGate's Browser DevTools & extensions category. It focuses on modifying HTTP request and response headers during browser-based development and testing. FlexHeaders is an open-source project aimed at web developers and QA engineers. FlexHeaders is open source under the Open Source license. It runs on the web and embeddable surfaces.

It is developed by harrisondeo, and it first shipped in 2024. Among its 6 catalogued features are request headers, response headers, and header editing.

Request headers
Response headers
Header editing
Header removal
Chrome support
Firefox support

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

License

Open Source

Verified signals

HTTPSOpen SourceFree tierStore-verified publisher

Indexing history

What PulseGate has recorded for this listing

Indexed9 Sept · 21:19 UTC
FlexHeaders - Modify HTTP Headers verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about FlexHeaders

What does FlexHeaders do?: FlexHeaders focuses on modifying HTTP request and response headers during browser-based development and testing. It is catalogued under Browser DevTools & extensions on PulseGate.
Who should use FlexHeaders?: FlexHeaders is an open-source project built for web developers and QA engineers.
Does FlexHeaders have a free plan?: Yes — FlexHeaders is open source under the Open Source license and free to use.
What platforms does FlexHeaders run on?: FlexHeaders runs on the web and embeddable surfaces.
Is FlexHeaders still maintained?: Unverified. FlexHeaders 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 are alternatives to FlexHeaders?: Similar projects tracked by PulseGate include Headers, FF Headers, and Mozilla Custom Headers.Headers FF Headers Mozilla Custom Headers
Who develops FlexHeaders?: FlexHeaders is developed by harrisondeo.
How long has FlexHeaders been around?: FlexHeaders first shipped in 2024.

At a glance

Pricing: Open Source
Platforms: Web
Languages: English
License: Open Source
Built for: web developers and QA engineers
Model: Open source
Solves: Modifying HTTP request and response headers during browser-based development and testing.

Registered as

Chrome Web Store: gffpeamhhldhibdngenbfciboinanppf
Firefox Add-ons: flexheaders-alter-http-headers

Developer

harrisondeo

Index record

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

Identity audit (13)

Slug: flexheaders-modify-http-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: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Taken from the project's own store listing.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 9 Sept 2026
Canonical URL: https://github.com/harrisondeo/FlexHeader

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