There's a reproducible bug: The user goes to (for example) Google.com, writes something, presses Return and quickly presses Alt+Tab to go to another window. MindTheTime continues counting the time...

That does not happen using the addon "Webtime Tracker", so (even if there is a Firefox bug) the problem is avoidable.

スリープ復帰するとスリープ中の時間がアクティブなタブに加算されることがあるため、集計が正確ではない。

Time is sometimes not correct. For example, the screen time measured by the MacOS screen time is less than the mind the time screen time by about 2 hours.

[EDIT]
Seems that the timer counts the time even when the computer is in sleep mode sometimes. Please fix this!

Could be a bit more customizable too.