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HeaderMod

ExtensionDeveloper Tools386 users
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Overview

Inject, update, edit, modify, override HTTP headers

**HeaderMod - Inject, update, edit, modify, override HTTP headers** A lightweight and open source browser extension that lets you intercept outgoing HTTP requests and inject, update, edit, modify, or override headers on a per-URL basis. **Key Features** * Define multiple header-modification rules * Wildcard-based URL matching (e.g., *.example.com/*) * Add or replace any request header (name + value) * Enable or disable rules individually * Persist rules in local storage for seamless browser restarts * Dynamic toolbar icon indicates active rules **Usage** 1. Click the HeaderMod toolbar icon to open the popup. 2. Click Add Rule to create a new entry, then fill in: * Header-Name and Header-Value * Optional URL Pattern (supports * wildcards) * Optional Notes for your reference * Enabled checkbox to toggle the rule 3. Modify or delete rules as needed. **What happens next** * Browse your sites as usual * Each enabled rule is tested against the request URL * Matching requests have their headers updated or appended before they leave the browser **Privacy** * HeaderMod does not collect, transmit, or share any personal data. All settings remain in your browser’s local storage and are never sent to any external server. Whether you need to spoof headers for testing or inject custom metadata into requests, HeaderMod puts you in control.

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Details

  • Version
    25.4
  • Updated
    August 12, 2025
  • Offered by
    UtilsFactory
  • Size
    16.7KiB
  • Languages
    English (United States)
  • Developer
    Email
    UtilsFactory@outlook.com
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

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The developer has disclosed that it will not collect or use your data. To learn more, see the developer’s privacy policy.

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

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