I couldn't reproduce this issue in an up-to-date Natty VM.
I suspect what is happening to you is your firefox is actually crashing
on shutdown, at which point firefox keeps your cookies and restores your
session.
Can you reproduce this with firefox 4.0 beta 8?
** Changed in: firefox (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/693791
Title:
firefox preserves logins across sessions when not asked to
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