With the new update all my tabs disappeared?!
Ok, when I was using FF a few days ago the browser suddenly closed down by itself, I think I was trying to visit a page that seemed to use a lot of memory in FF. Sadly enough I cannot remember what page it was, as when I restarted FF I just ended up with a Firefox is now updated page. All of my ~20 tabs is gone. Well, I can just find them again I guess, but I don't like it if you can never be sure if you have all your tabs next time you open your browser.
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At the top of the Firefox window, click the Firefox button, go over to History (click the History menu on Windows XP) and select Restore Previous Session.
See here for more details.