I was playing around with some cookie settings, and noticed I can tell certain sites to accept cookies "for session only". When the browser quits, the cookies are removed. The problem with that setup is: in OS X, the browser doesn't quit when you close all windows as it does when running in Windows. The session is continuous until I right click and quit firefox. Is there any way to make it end the session automatically when all windows are closed? I'm currently trying to get facebook to log out automatically on close, but I'm sure it could have other uses.