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I'm running FF1.07 and between closing it a few hours ago and opening
it now the entire history and all the auto-complete entries
disappeared. My Bookmarks, which I use as my home page, show no
links visited - actually many were in the last few sessions.

History is set for 9 days and cache size at 50 mb, as they always are.
This has also happened a few times with earlier versions. I don't
have any utilities clearing the cache.

What's happened and how can I avoid it?
TIA
Jim