HeaderMod UtilsFactory מאת

HeaderMod

A lightweight and open source browser extension that lets you intercept outgoing HTTP requests and inject, update, modify, or override headers on a per-URL basis. Define custom rules with wildcard URL patterns and toggle them on or off.

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:
• URL Pattern (supports * wildcards)
• Header Name and Header Value
• Optional Comment for your reference
• Enabled checkbox to toggle the rule
3. Modify or delete rules as needed.
4. Click Save All to store your modifications and automatically close the popup.

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
• All rules and settings are stored locally in your browser’s storage. No user data, browsing history, or request details are ever sent to external servers or third parties. HeaderMod operates entirely on your machine.

Whether you need to spoof headers for testing or inject custom metadata into requests, HeaderMod puts you in control.