If Firefox is forcibly closed (or crashes) while gmail is open, opening the browser and restoring tabs brings back the gmail page logged in. This is inversely to Chrome's behavior, which in my opinion is how it should be. The way Firefox restores tabs, would allow someone to gain access to my gmail account if Firefox itself or the computer crashed or say there was a power loss and the computer shut down. Someone else could at that point bring the computer back up (or open Firefox) and be presented with my gmail account logged in. How can I prevent this behavior? I assume it's a cookie or something like that?