# HeaderSmith – cod3rjava

> Modify/override request headers in Firefox based on user-defined rules (with optional URL regex filter).

Canonical page: [https://chrome-stats.com/d/headersmith-cod3rjava](https://chrome-stats.com/d/headersmith-cod3rjava)

## Overview

- **ID:** `headersmith-cod3rjava`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** cod3rjava
- **Category:** web-development,privacy-security,search-tools
- **Daily users:** 1
- **Weekly downloads:** 1
- **Version:** 0.1.3
- **Last updated:** 2026-01-21
- **First published:** 2026-01-18
- **Size:** 14 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/headersmith-cod3rjava/)

## Description

Use HeaderSmith – cod3rjava to override outgoing request headers directly in Firefox.

Features:
- Add multiple header rules (name/value) and enable/disable each rule
- Optional URL regex filter to apply rules only to matching URLs
- Rules are stored locally in the browser (storage.local)

Privacy:
- No data is collected or transmitted off-device.
- The add-on only modifies request headers for requests matching your configuration.

Notes:
Some headers may be restricted by Firefox and cannot always be modified.

## Rankings

- #116,595 — Overall
- #172 — override

## Permissions and access

### Permissions

- `storage`
- `webRequest`
- `webRequestBlocking`
- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate 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/headersmith-cod3rjava)