Generally speaking, when given a cookie that has no expiration period, modern browsers will consider this cookie to be a 'session cookie', they will remove the cookie at the end of the browsing session (generally when the browser instance closes).

IE, Opera, Safari and Chrome all support this behavior.

However firefox (3.0.9 latest proper release) appears not to follow this rule, from what I can tell it doesn't expire the cookies when the browser is closed, or when the user logs off or restarts the OS..

So, why does firefox refer to these as session cookies, when they last aparently indefinitely?

Does anyone know how Firefox handles session cookie expiration?