Try doing this... Especially removing whole months or the "older than 6 months" part, and look at the amount of memory FF consumes. Is it trying to clear that sqlite thing using single transaction or what? Or create a single sql statement gluing together tens of thousands "DELETE FROM ..." strings? No, it cannot be that simple. Recently I tried to clean browsing history on FF's "profile" which was quite old and unmanaged. The process quickly ate more than 5 gigs of RAM (the OS needs around 350 meg after boot) and all the swap space that is set up badly (below 1 gig). After a minute or two of waiting for a text console (Ctrl-Alt-F1 or so), I had to do a hard-reset. It seems that killing the FF process just before all the memory is used is a workaround; at least the supposedly deleted history items are not present when you restart the browser and press Ctrl-H. Who knows what happens below? "If I don't see it, it's not there". Disk space is cheap these days, and so is RAM ...
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