Firefox Extension For Passwords

There are several Firefox password extensions. This can export the stored passwords to a file.

This can synchronize Firefox bookmarks to multiple machines/account via an intermediary FTP server.

Create an extension to store the passwords on a web site so that the extension will lookup up and complete logon/password fields at any web site. The web site storage can be encrypted with a master password. There can be functionality to help user change account passwords.
No revenue potential.

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$20, free trail. Password Revealer is a utility that can show you most passwords that are typed in a password edit box (those that hide the password and show asterisks instead).
Run Password Revealer, and drag the revealing icon to the hidden password.

$15 Password revealer reveals most passwords hidden behind asterisks row on web pages and almost any application with only one click.