Note that we should throw this out on shutdown rather than deciding on next start whether we want to use it or not - we really don't want all this crap laying around on disk if it's not an immediate-restart situation. When the browser is shut down cleanly we should discard all the session information, including session cookies, form data, and session history.
Firefox 3 makes it much easier for people to switch to this option (good for usability) but doesn't at all educate people about the implications of building this on top of a "session" restore feature. This was true in Firefox 2 but the setting was not all that discoverable. When users shut down the browser cleanly they (and many of the websites they're using) think they are logged out and done, but in our implementation they are not. However, it's a bad idea for the "Use my tabs from my last session" option. In the case of a crash or restart after install this is generally what we want to happen - get the user up and running right where they left off. It's by design and known so I'm going to unhide the bug. This happens because session-restore saves session cookies (hence the name).
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