I close my browser often for various reasons, and having to repeatedly log into my accounts like Facebook, Yahoo, Gmail, and etc, is very inconvenient and getting gold. Firefox 2 never did this, just my current Firefox 3.
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I have the same problem. I dont know how to fix it. I dont mind all that much though.
It’s logging you out because it’s deleting all the tracking cookies that websites have planted on your computer. That is a very GOOD thing! However, Facebook, Yahoo, Gmail, etc all use cookies, too.
Find where you can set your “Preferences” or “Options” and then find where you can allow certain cookies to remain on the computer. I’m running FF 3.5 and can’t recall at this time the exact path to take to get there. It’s either under Edit or Tools. Once you find Preferences or Options go to Privacy and then under the Cookies section set your Exceptions to allow the particular sites you want to stay logged into.
I hope this helps. Good Luck!