Download Master Tools

Name: Master Tools
Author: Welling

By: Welling

Download Master Tools (current and past versions) for Firefox

Latest Version: 1.2.25 Updated: 7 months ago

Ready to install?

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

View source code

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Available versions

You can find the current and older versions of Master Tools 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	Timestamp
1.2.25	XPI · ZIP · Source code	747.30KB	2025-12-12
1.2.24	XPI · ZIP · Source code	737.34KB	2025-10-25
1.2.23.8	XPI · ZIP · Source code	735.91KB	2025-06-10

2025-12-12 · 0 downloads

XPI ZIP Source code

2025-10-25 · 0 downloads

XPI ZIP Source code

2025-06-10 · 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 Master Tools ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Master Tools ZIP file from step 1. Master Tools is now installed on your browser.