Download Quick Countdown Timer Lab

Name: Quick Countdown Timer Lab
Author: Kimberly Nelson

By: Kimberly Nelson

Download Quick Countdown Timer Lab (current and past versions) for Firefox

Latest Version: 1.0 Updated: 23 days ago

Ready to install?

Quick Countdown Timer Lab is available to install from Firefox Add-ons Store and for download from this page.

View source code

Available versions

You can find the current and older versions of Quick Countdown Timer Lab 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	XPI · ZIP · Source code	21.49KB	0	2026-05-13

2026-05-13 · 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 Quick Countdown Timer Lab ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Quick Countdown Timer Lab ZIP file from step 1. Quick Countdown Timer Lab is now installed on your browser.