I am sorry if the title of the question sounded ridiculous. I will explain better. Last night I had signed in with my gmail account on my mom's laptop. The browser was Firefox already set in "Private Mode" , that means that when I open Firefox and whatever I do is not "remembered". So, I had signed in with this account and don't remember if I had closed the window or not, since it's been her that after shut down the laptop. I would like to know if my gmail account window was still there, visible to her. Is there a way to check it?
EDIT: I do know how to sign out of multiple devices and browsers all at once. It's just not this case since I've been already signed out automatically from that laptop (that's because it's in Private Mode) so no need to sign out of multiple devices. My question is how do I know if my gmail account window was still open or if I had closed it this early before she shut down the laptop.
It's about time. Is there a way to know how many hours my gmail account was signed in on that one laptop?