Firefox [edited]

Firefox is a computer app it can't actually such, and here the people are users like you. Firefox doesn't update your browser it is a non sentient app, but you may have set Windows to update automatically so you could check that so it doesn't happen on your device under your watch. Anyway why are you so upset what happened after the update, is it just the tabs, and how many? Have you looked into any other Profiles you may have to see if they are there [about:profile] That URL will show you where all your data is kept and you can manually look there to see what there is. So whether you choose to have a Windows auto update or in future you elect to update, best save and export etc. Settings > Account and synchronisation > Backup Hope you feel a bit better All the best