The fact that Firefox’s show passwords option is so easy to reach is often a godsend for me because more often than not I forget which login I used with which web site.
If your PC is used by more than one person though there is a security issue you may need to worry about when it comes to showing others your login information.
By default, if you go under Tools, then your Options and then the Security section, anybody could get in there and look at your user names and passwords – as long as they had access to your PC. To fix that you want to set a master password.
First go to Tools and then Options. From there your Firefox options window should pop up and you want to go to the Security tab. From there check the box that says “Use a master password”. Now another box should come up asking you for your master password – type it in twice, and make sure you remember it.
Now when you go to Tools, Options, Security and then under the Passwords section hit the “Show Passwords…” button it should ask you for your master password before showing all your saved password information.