Chrome //
Extensions 
Chrome
Web store 
Days Until (Days Countdown)
Displays the number of days until a specified date right in the toolbar. (Days Countdown)
Lightweight Alarm Clock, Timer & Countdown
Alarm clock, timer, and countdown with sound and desktop notification.
Tab Countdown Timer
A Chromium Extension that allows you to set a timer that counts down and then closes the tab.
Steep and Cheap Countdown Timer
Steep and Cheap sells outdoor gear one screamin'(50-80% off) deal at a time until time runs out. (steepandcheap.com)
Christmas Countdown and Radio
A beautiful Christmas Countdown. Also, a list of Christmas radio stations that you can listen to all day.
Countdown Killer
Automatically kills countdown timers for video and download sites. Currently works for ProjectFreeTV, Gorrillavid,DaClips,MovPod.
Chainlove Countdown Timer
Chainlove sells bike gear for dirt and pavement one screamin'(50-80% off) deal at a time until time runs out. (chainlove.com)
Online Countdown
Create online countdown timer to any date and time and share or embed the widget on your site. 100% FREE. Try it now!
Pokemon Countdown Timer
This is a fan-made extension that allows anyone to quickly check how soon the new Pokemon games will be released!
Countdown Clock, Stopwatch with Drive
Manage your favorite events. set up to 20 countdowns,stopwatchs. Remaining time until the deadline or ToDo for Google Drive file.
Whis'key' Militia Countdown Timer
Whis'key' Militia sells skateboarding gear one screamin'(50-80% off) deal at a time until time runs out. (whis'key'militia.com)
Nice Countdown
Nice looking extension to count the days, hour and minutes to a certain point in the future.
Workweek Countdown
A countdown clock to count the time left until a weekend. Helps you to answer this question quickly, so you can get back to work