In FF 79.0 (beta) i added the extension and clicked to define the time, it started tounting down, but when i click somewhere else, the pop up window disappear and countdown freeze. Until i click the clock button again and the counter is reseted/inactive. :-/

Довольно симпатичный и удобный таймер.Нравится

Works very well without any of the glitches that seem to plague the other timer extensions I tried. Only request would be the addition of an option to restart the previous timer, without having to drag the timer bar each time. Also maybe a few more sound options :)

The sound of the alarm is to sharp but it is convenient