Φόρουμ υποστήριξης - Firefox

Hello,

Everytime I have to close my pc with updates or if I just close/ restart it or if it crashed and I have to restart everything, all my most recent tabs (when I do restore last session) are gone but I get all the tabs back from weeks or even months ago. It's very annoying especially I do research and study. I really don't understand. It's like going back in time every time it starts again  :( What is happening ?

Thank you for your help ! Vanessa