how do I stop ccleaner deleting Hotmail login details in Firefox?
After logging in to Hotmail, close down your browser, and look in "Options\Cookies", and there should be a cookie named "login.live.com" in the Cookies To Delete window.
Move it across to the Cookies To Keep window. That should do it.
Actually, you need to keep both "login.live.com" and "live.com".