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Reset your master password
If you have lost or forgotten your Master Password or you want to disable the feature, reset your master password. Note that, upon resetting, you will lose all the stored information in the Password Manager as this is a built-in security feature to prevent people otherwise resetting your master password and gaining access to your passwords.
* For Firefox ~1.5: enter "chrome://pippki/content/resetpassword.xul" (see Chrome URLs) in the location bar and click on "Reset"
* For Firefox 1.5: "Tools -> Options ->Privacy -> Passwords -> Remove Master Password"
* For Thunderbird ~1.5: "Tools -> Options -> Advanced -> Saved Passwords -> Master Password -> Reset Password".
* For Thunderbird 1.5: "Tools -> Options ->Privacy -> Passwords -> Remove Master Password"
* For Mozilla Suite: "Edit -> Preferences -> Privacy & Security -> Master Passwords -> Reset Password".