[kxs]

Do you use an extension in Chrome to do this or surf permanently incognito? I was under the impression that it's not (yet) possible to do so automatically in Chrome (vanilla).

[waitwhat]

Wrench -> Options -> Under the Hood -> Privacy -> Content Settings... -> Cookies -> "Clear cookies and other site data when I close my browser"

[kxs]

Thanks, my fault, I mixed it up with "Clear Browsing Data".