Clear History/Cookies on Exit

[EddieCeausu]

I just want to thank everyone for building a beautiful browser that doesn't kill my battery. I was hoping that there was a way to clear the browser cookies and history on exit similar to what Firefox has in place. I am sure this must be a way to do this as a userscript using window.onbeforeunload but I am not sure how to invoke this for a browser session and not for each tab.