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TimerFox counts down from a predefined number and alerts you with a custom message.
This extension is a simple timer. You enter the hours, minutes, and seconds, as well as a message to display, and the timer counts down to it. The time left is displayed in the icon for your convenience. When the timer is complete, the message you selected pops up in an alert box. TimerFox is free for use in Firefox.
TimerFox Countdown window and toolbar button.