ModHeader

Add and modify the HTTP request headers and response headers. Use ModHeader to: - Add / modify request and response headers - Add / modify cookies - Multi-profile support - Filtering based on URL, tab, or window - Export and share profiles

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ModHeader is available for download. It had 19,864 active users before it was removed from Firefox Browser Add-ons on 2024-05-01, and it has been downloaded from Firefox-Stats 22 times. The latest version is 4.4.1, and it was published 8 months ago. Be careful when installing it.

All available versions

You can find the current and older versions of ModHeader here. You can download the archived versions or inspect their source codes.

As a free user, you can only download the latest version.

How to install ModHeader from an XPI file

1. Simply drag-and-drop the XPI into Firefox to install the add-on.

How to install ModHeader from a ZIP file

1. Download the ModHeader ZIP file
2. In Firefox browser, go to about:addons to open Add-ons Manager
3. Click on , then select Install Add-on From File
4. Select the ModHeader ZIP file from step 1. ModHeader is now installed on your browser.