I will describe from the beginning. When I reopened my Firefox session with the tabs I left saved in the history, I ended up with a single window with nothing open. I don't understand what happened, I start to put a couple of those tabs back in and when I go to click on one of the ones saved in the history it tells me that they are open on a DESKTOP-xxxxx unknown to me. I go into the router's network to see the connected devices and this computer is not there. What's going on? Should I be worried?