Download Header Tool

Name: Header Tool
Author: loreii

By: loreii

Download Header Tool (current and past versions) for Firefox

Latest Version: 1.0.0 Updated: 25 days ago

Ready to install?

Header Tool is available to install from Firefox Add-ons Store and for download from this page.

View source code

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Total downloads

Available versions

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

As a free user, you can download up to 3 latest versions.

Upgrade to download older versions

Version	Download	Size	Download count	Timestamp
1.0.0	XPI · ZIP · Source code	35.52KB	0	2026-06-15

2026-06-15 · 0 downloads

XPI ZIP Source code

Install XPI file

An XPI file, short for "XPInstall," is a compressed file format used primarily by Mozilla applications, like Firefox and Thunderbird, to distribute and install add-ons or extensions. These files are similar in function to CRX files for Chrome but cater to the Mozilla ecosystem.

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

Install ZIP file

Download the Header Tool ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Header Tool ZIP file from step 1. Header Tool is now installed on your browser.