Can I set up Firefox to log out of all accounts/websites when I close it?
I recently went away for a few days--left the computer running but closed Firefox. Turns out I was still logged into Hotmail the whole time, resulting in 1.5G/day of unauthorized surplus bandwidth use and a dozen or more unauthorized e-mails/spam from the Hotmail acct. (I have Norton Anti-Virus 2011, but I believe that this was backdoor hijacking of my PC via the open Hotmail account.).
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Are you using session restore to reopen tabs automatically the next time?
You can set the pref browser.sessionstore.privacy_level to 2 (never) or 1 (non-HTTPS, default in Firefox 3 versions) on the about:config page to disable saving cookies via session restore.