If you don't set an expiration for a cookie, will it be lost when the browser is closed?

Question

If you don't set an expiration for a cookie, will it be lost when the browser is closed?

Answer 1

If it has no expiration, then it will. It will be treated as a Session cookie. An exception to this are new versions Firefox, which can save your session.

Answer 2

You are correct. If you don't set an expiration for a cookie it will be stored only in memory and removed when the session ends. If you do set an expiration, it will be stored on the hard disk.