Download Simple Countdown Timer1

Name: Simple Countdown Timer1
Author: leahan

By: leahan

Download Simple Countdown Timer1 (current and past versions) for Firefox

Latest Version: 1.0 Updated: a year ago

Ready to install?

Simple Countdown Timer1 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 Simple Countdown Timer1 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	8.76KB	0	2025-06-26

2025-06-26 · 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 Simple Countdown Timer1 ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Simple Countdown Timer1 ZIP file from step 1. Simple Countdown Timer1 is now installed on your browser.