Download Week Calculator

Name: Week Calculator
Author: Charles

By: Charles

Download Week Calculator (current and past versions) for Firefox

Latest Version: 3.0.1 Updated: 2 months ago

Ready to install?

Week Calculator 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 Week Calculator 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
3.0.1	XPI · ZIP · Source code	17.47KB	2026-04-24
3.0.0	XPI · ZIP · Source code	17.48KB	2025-06-27
2.0	XPI · ZIP · Source code	17.33KB	2025-06-07

2026-04-24 · 0 downloads

XPI ZIP Source code

2025-06-27 · 0 downloads

XPI ZIP Source code

2025-06-07 · 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 Week Calculator ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Week Calculator ZIP file from step 1. Week Calculator is now installed on your browser.