# Header Override

> Modify request headers, response headers, and cookies with local URL rules and profiles.

Canonical page: [https://chrome-stats.com/d/headeroverride](https://chrome-stats.com/d/headeroverride)

## Overview

- **ID:** `headeroverride`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** headeroverride.com
- **Category:** web-development
- **Daily users:** 7
- **Weekly downloads:** 1
- **Version:** 1.0.11
- **Last updated:** 2026-08-22
- **First published:** 2026-07-14
- **Size:** 58 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/headeroverride/)
- **Website:** [https://headeroverride.com/](https://headeroverride.com/)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/headeroverride/privacy/](https://addons.mozilla.org/firefox/addon/headeroverride/privacy/)

## Description

Header Override is a developer tool for managing URL-scoped rules that modify request headers, response headers, request Cookie values, and response Set-Cookie values.

Create rules from the extension popup, choose whether each rule affects outgoing requests or incoming responses, and scope each rule with browser's declarative URL filter syntax. Header Override can add request headers, add response headers, append request Cookie values, and add response Set-Cookie values with common cookie attributes such as Domain, Path, SameSite, lifetime, and Secure.

Use profiles to keep separate rule sets for development, QA, demos, clients, or debugging sessions. Profiles can be activated from the popup, and selected profiles can be exported or imported as JSON when you need to move configurations between browsers or machines.

Rules are saved locally in browser and applied automatically with browser's declarativeNetRequest API. Header Override does not use analytics, tracking, remote code, or external servers.

Features:
<ul><li>Add custom request headers.</li><li>Add custom response headers.</li><li>Append request Cookie values.</li><li>Add response Set-Cookie values.</li><li>Configure response cookie attributes, including Domain, Path, SameSite, lifetime, Max-Age, and Secure.</li><li>Scope rules to specific URLs or URL patterns.</li><li>Group rules into local profiles.</li><li>Activate a profile for the current debugging workflow.</li><li>Import and export selected profile configurations.</li><li>Add optional comments to label or document each rule.</li><li>Enable, disable, add, and delete rules from the popup.</li><li>See the active applied rule count in the extension badge.</li><li>Local-only storage with no analytics, tracking, remote code, or external servers.</li></ul>

## Rankings

- #39,547 — Overall
- #12 — override
- #30 — overdrive
- #50 — header
- #166 — response

## 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 recently changed publisher email (might be a transfer in ownership)

> 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/headeroverride)