Hi. Usually, when I clear recent history (with cache, cookies, etc.) before closing firefox and after reopen, windows and tabs (previous session) pop up and I can go back to work. This time it didn't happen. I don't know what to do! I've checked and all the boxes for saving/restoring session/tabs or whatever else are ticked. There was an update and even recently closed windows or apps were grey. I need those tabs ASAP. Please help!!