https://addons.mozilla.org/en-US/firefox/addon/4622

You would think vendors would have thought of doing this. Since all sensitive data that may have to be removed on browser exit can still be recovered. Hopefully Mozilla makes this standard so people using public machines like at libraries or internet cafes can safely clear their info. I can't vouch on the security of the above extension's wipe methods in use, but its better than nothing. =o\