I am attending college classes on line, I frequently have 4 tabs pinned, and 3-4 further tabs open. Without any discernible pattern I can fathom, Firefox will close everything. I have no add-ons to remove, update or restart. I have no plug ins to remove, update or restart. My drivers and Windows OS are all up to date. I ask my Firefox to delete my history and clear the cash when it is closed, so it takes me roughly 5-20 minutes to log back into everything I'm doing for class or my personal life when this happens. Upon researching this matter today, all the fixes I can find involve removing add-ons and plug ins. Or updating them. Or turning them off. I have none to try this fix on. The advice on the main page says to check that all system are up to date. I have checked, they are. Hoping someone has some advice. Thanks!