[Project_owners] Find time duration of Firefox-inactivity

[InBasic]

Hi there,

I am interested if any body can suggest a way to find out how much time
Firefox is inactive from last use ?  (maybe track mouse & keyboard move,..)

P.S: I want to add feature to "Auto shutdown" extension  to
shutdown,hibernate,.. PC after specific time of inactivity of Firefox
(suggested by a user)

Regards,
InBasic
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