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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.
Since TimerFox's final release for Firefox in April of 2015, Mozilla has abandoned its own technologies in favor of poor parody of Google's protocols (WebExtensions), leaving many developers, including this one, disillusioned with the direction the Mozilla is taking. In contrast, Pale Moon has stepped into place as an XUL-centric browser, keeping backward compatibility better than Mozilla's own flagship project. So, for now, TimerFox may be considered a Pale Moon and SeaMonkey extension that still supports older versions of Firefox.