Hello, I went from being able to reopen Mozilla and have all tabs open. This stopped happening a couple of days ago. I do not have the restore previous session as was suggested to try when I searched this topic. I went into manage history, import and backup, restore, then selected the most recent date available. At first it didn't seem to work and I started searching through history to reopen tabs one by one. I left my computer (still running) came back and all my tabs had miraculously reappeared. I checked my settings to make sure nothing had changed. It hadn't - still set to reopen tabs when opening Mozilla. Closed the laptop last night, This morning - no tabs!!! I have a lot of tabs, and groups of tabs, with info I need. How do I recover these tabs and stop this from happening again? Thank you.