Use a Ramdisk to increase Firefox security.
This article discusses how to increase the speed and security of Firefox using an oldie but goodie technique known as a ram disk. The benefit is that it is faster than a hard drive because RAM is faster than hard drives and that everything that gets written to it will be gone once you restart the computer - unless you mount and save what you want to your hard drive before you power off or restart your computer.
Note: The writeup is written for Windows users of Firefox. An equivalent Linux variant probably exists somewhere, but I have not yet looked for it. When and if I find it I wlll post it in this thread.
Note: A ram disk is what a Live CD creates in memory and boots from, i.e. a file system to boot an image from without booting from a hard drive.
-- Tom