Do you plan to update Windows app soon? It misses a lot of functionality comparing to Mac version. I miss most is detection of Idle time… 
Does Firefox plugin detect idle time?
Hi Michal, welcome to the Clockify forum!
We appreciate the feedback, there are plans to update the Windows app in the future, and adding Idle detection is one of the features that are on our roadmap.
Yes, the Clockify Firefox plugin does have the Idle time detection feature, as well as our Chrome browser extension. Here you can find more information about it.