Download DefPromo

Name: DefPromo
Author: Profullstack, Inc.

By: Profullstack, Inc.

Download DefPromo (current and past versions) for Firefox

Latest Version: 1.4.9 Updated: 5 months ago

Ready to install?

DefPromo 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 DefPromo 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
1.4.9	XPI · ZIP · Source code	412.66KB	2026-01-30
1.4.7	XPI · ZIP · Source code	412.66KB	2026-01-04
1.4.5	XPI · ZIP · Source code	413.90KB	2025-11-24

2026-01-30 · 0 downloads

XPI ZIP Source code

2026-01-04 · 0 downloads

XPI ZIP Source code

2025-11-24 · 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 DefPromo ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the DefPromo ZIP file from step 1. DefPromo is now installed on your browser.