Download CalendarUSP

Name: CalendarUSP
Author: Henrique

By: Henrique

Download CalendarUSP (current and past versions) for Firefox

Latest Version: 1.4.1 Updated: 18 days ago

Ready to install?

CalendarUSP 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 CalendarUSP 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
1.4.1	XPI · ZIP · Source code	49.36KB	2026-06-24
1.4	XPI · ZIP · Source code	56.66KB	2026-06-09
1.3	XPI · ZIP · Source code	51.81KB	2025-12-15
1.2	Paid users only	53.18KB	2025-08-11
1.0	Paid users only	52.29KB	2025-08-07

2026-06-24 · 0 downloads

XPI ZIP Source code

2026-06-09 · 0 downloads

XPI ZIP Source code

2025-12-15 · 0 downloads

XPI ZIP Source code

2025-08-11 · 0 downloads

Paid users only

2025-08-07 · 0 downloads

Paid users only

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