My FFP updated last week and I have 3.0.10. After that upgrade my cookies keep on getting deleted. I will select remember me when logging into any site. If I close FF and open it back up it does not remember me. It happens with Gmail, Yahoo, and all sites that use cookies. My cookie setting is set to "keep until they expire". This is pissing me off... for all the sites I goto I have too login every time. 
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Cookies expiring
May 13, 2009 - 9:22pm
#1
Cookies expiring
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Same issue.
https://addons.mozilla.org/en-US/firefox/addon/82
THERE IS A FIX!!! I found it here: http://forums.mozillazine.org/viewtopic.php?t=583434 What you have to do is delete your cookies.sqlite file from your profiles folder. This goes for regular Firefox and Firefox Portable. You can search the forums or Google search on where the profile folder is. For Firefox Portable it is in FirefoxPortable\Data\profile. I don't have regular Firefox so I can't tell you for that. But that's all you have to do, just delete the cookies.sqlite. Something is probably corrupting it and Firefox maybe isn't giving an error when closing it. I moved my cookies.sqlite to another folder just in case I needed it, but I don't think I'll need it now. I'm so happy!!!
Thanks
Thanks. The file deletion seems to be working.