ving, Chris's link had similar/same solution. I got this one from the Mozilla forums. Remember when I deleted a profile & it took everything out of 'My Documents' folder as well.. (photos, emails, the lot)! Lucky I had back up cd's...
See attached as to where to store your 'precious'......
Slick, do you have 'Keep Cookies' > 'until I close Firefox' in 'Privacy' section? Try 'view cookies' & see what's going on re; time limits etc.
I hope I'm on the right track!

L.
ps. Also, tick check box > allow sites to set cookies, but uncheck > from originating web site only. See if that works. I have it set like that. np. HTH.!!!!!
pps. If that doesn't work, then it's off to Mozilla.org for you.