Who is SimpleModifyHeaders for?

SimpleModifyHeaders is a consumer product built for web developers and browser testers.

Does SimpleModifyHeaders have a free plan?

Yes — SimpleModifyHeaders is free to use.

What platforms does SimpleModifyHeaders run on?

SimpleModifyHeaders runs on the web and embeddable surfaces.

Is SimpleModifyHeaders still maintained?

Unverified. SimpleModifyHeaders 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 SimpleModifyHeaders?

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

Who makes SimpleModifyHeaders?

SimpleModifyHeaders is developed by didierfred.

How long has SimpleModifyHeaders been around?

SimpleModifyHeaders first shipped in 2018.

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SimpleModifyHeaders

Name: SimpleModifyHeaders
Author: didierfred

github.comBrowser DevTools & extensions

SimpleModifyHeaders is a Chrome and Firefox browser extension for changing HTTP request and response headers. It helps developers and testers configure header rules while browsing websites and debugging web behavior.

FreeWebEmbeddable

Visit github.com

Overview

5 features

SimpleModifyHeaders is a Browser DevTools & extensions project. It focuses on modifying browser HTTP headers for testing, development, and web compatibility tasks. It is built as a consumer product for web developers and browser testers. SimpleModifyHeaders costs nothing to use. It runs on the web and embeddable surfaces.

Behind SimpleModifyHeaders is didierfred, and it first shipped in 2018. Among its 5 catalogued features are header modification, request rules, and response rules.

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

Header modification
Request rules
Response rules
Chrome support
Firefox support

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed8 Sept · 04:27 UTC
simple-modify-headers verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about SimpleModifyHeaders

What does SimpleModifyHeaders do?: SimpleModifyHeaders focuses on modifying browser HTTP headers for testing, development, and web compatibility tasks. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is SimpleModifyHeaders for?: SimpleModifyHeaders is a consumer product built for web developers and browser testers.
Does SimpleModifyHeaders have a free plan?: Yes — SimpleModifyHeaders is free to use.
What platforms does SimpleModifyHeaders run on?: SimpleModifyHeaders runs on the web and embeddable surfaces.
Is SimpleModifyHeaders still maintained?: Unverified. SimpleModifyHeaders 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 SimpleModifyHeaders?: Similar projects tracked by PulseGate include Headers, Mozilla Custom Headers, and FlexHeaders.Headers Mozilla Custom Headers FlexHeaders
Who makes SimpleModifyHeaders?: SimpleModifyHeaders is developed by didierfred.
How long has SimpleModifyHeaders been around?: SimpleModifyHeaders first shipped in 2018.

At a glance

Pricing: Free
Platforms: Web
Languages: English
First seen: 8 Sept 2026
Built for: web developers and browser testers
Model: B2C
Solves: Modifying browser HTTP headers for testing, development, and web compatibility tasks.

Registered as

Firefox Add-ons: simple-modify-header

Developer

didierfred

Index record

Indexed: 8 Sept 2026
Lifecycle: Alive
First seen: Sept 2026
Last seen: 8 Sept 2026

Identity audit (13)

Slug: simple-modify-headers-github-com
Lifecycle state recorded: 8 Sept 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 8 Sept 2026
Timeline basis: Indexed-at chronology (no inferred launch/funding milestones).
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: 8 Sept 2026
Canonical URL: https://github.com/didierfred/SimpleModifyHeaders/tree/v1.8.1

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