Har har. I've just had the third experience over just a couple of months, where FF has completely lost all my tabs etc. Previously I've been able to recover so

Har har. I've just had the third experience over just a couple of months, where FF has completely lost all my tabs etc. Previously I've been able to recover some state by moving the sessionstore-backups files around, but this time, completely gone. The trigger this time was starting FF when my internet was down. It could not 'verify' all the addons, and just seemed to hang indefinitely. Really, why does it need t 'verify' the extensions on startup? And what does that involve, actually? Is it phoning-home all my addons and settings just to even start up? I've really lost trust in this browser.