Simple Countdown Timer1 by leahan

Hẹn giờ 1, 5, hoặc 10 phút từ bất kỳ trang web nào.

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About this extension

Function: Allows one-click countdown of 1, 5, 10 minutes from any website, no need to open another app.
Simple: A popup selects the time and displays a warning after the time is up.

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