More tricks
Removing never save passwords a.k.a. make firefox forget a saved password
Mozilla Firefox Version 2.0:
Tools -> Options ... -> Security -> Exceptions -> Select the site and click on Remove.
Mozilla Firefox Version 1.5:
Tools -> Options ... -> Privacy -> Passwords -> View Saved Passwords and select the Passwords Never Saved tab.
Mozilla Firefox Version 1.0:
Tools -> Options... -> Saved passwords -> View saved passwords and select the Passwords Never Saved tab. After you remove pages from the list in future you will be asked again whether you want store any passwords used on that page.
Removing stored passwords from Mozilla FireFox
Mozilla Firefox Version 2.0:
Tools -> Options ... -> Security -> Show Passwords -> Remove All
Mozilla Firefox Version 1.5:
Tools -> Options ... -> Privacy -> Passwords -> View Saved Passwords
Mozilla Firefox Version 1.0:
Tools -> Options... -> Saved passwords -> View saved passwords