Since upgrading to Firefox 5.0, '''some''' of my stored passwords are disappearing. Earlier this morning I logged into a webmail site where I have more than one account (with saved password). Later, I went to log on to another account on the site, and I noticed the username/password used earlier, were no longer in the list. I checked in 'Tools - Options - Saved Passwords', and that entry was gone. This has happened to multiple passwords to multiple sites. How can I prevent my passwords disappearing?