Google allows a logout from a GET request, on Chrome of all browsers? Is there a way to run browser tabs completely sandboxed regarding cookies/auth? (private browsing mode and running different browsers is a bit too clunky)
Chrome allows you to set up multiple user profiles; each one is isolated from the others. Like Incognito mode, it's per-window, not per-tab. I have one for GMail, one for Facebook, and one for everything else.