# Overhead — HTTP Header Editor

> Modify HTTP request & response headers. Switch environments (LIVE/DEV). 100% local, no tracking, open source.Modify HTTP request & response headers and switch environments (LIVE/DEV) in one click. 100% local, no tracking, open source.

Canonical page: [https://chrome-stats.com/d/overhead-http-header-editor](https://chrome-stats.com/d/overhead-http-header-editor)

## Overview

- **ID:** `overhead-http-header-editor`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** theconcept technologies
- **Category:** web-development
- **Daily users:** 2
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 0.1.5
- **Last updated:** 2026-07-22
- **First published:** 2026-07-15
- **Size:** 78 KB
- **Data as of:** 2026-09-07
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/overhead-http-header-editor/)
- **Website:** [https://theconcept-technologies.com](https://theconcept-technologies.com/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/overhead-http-header-editor/privacy/](https://addons.mozilla.org/firefox/addon/overhead-http-header-editor/privacy/)

## Description

Overhead is the header editor you can actually trust.

Add, modify, or remove HTTP request and response headers while you build and test web apps — and switch whole environments (LIVE, DEV, Staging, …) with a single click. Manage everything right from the toolbar popup: quick inline editing, header-name autocomplete, and one-click templates for the headers you reach for most (Authorization, User-Agent, X-Forwarded-For, CORS, and more).

Built to be trusted

100% local — your rules never leave your device.
No tracking, no analytics, no ads. Ever.
Open source, so anyone can verify it.
Uses Chrome's declarativeNetRequest engine, so the extension can't even read your traffic — it only declares rules the browser applies.
Features

Request & response headers: set, append, or remove.
Environment groups with mutually-exclusive switching (LIVE ↔ DEV).
URL wildcard / regex / resource-type conditions.
Optional per-header display labels.
Import your existing ModHeader setup in one click.
Light & dark, keyboard-friendly, fast.
Free and open source, from theconcept technologies.

## Rankings

- #60,784 — Overall
- #37 — modheader
- #167 — header
- #182 — environment
- #186 — editor

## Permissions and access

### Permissions

- `declarativeNetRequest`
- `storage`

### Host permissions

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/overhead-http-header-editor)