Which site does StaffCounter count if multiple tabs are open in the browser?

At any given time the user can in fact work with only a single tab, that is, with only a single web address. When the user switches from the tab with address A to another tab with address B, StaffCounter registers an end to the working session with address A and begins a new working session with address B. Each session is counted separately in the log. Thus, the time spent working with each web address is totaled from all sessions logged for this web address.