When the SavePasswords property is set to True, the
control prompts to save usernames and passwords entered in forms,
making them available for later autofill. While convenient for end
users, applications embedding the control may choose to disable this
to avoid storing sensitive information on the client system,
particularly in enterprise or shared environments. Setting this
property to False prevents passwords from being saved.
If the InPrivate property is True or the DataFolder
property has not been set to a folder where a user profile
will be stored, this property has no persistent effect. Although the
browser will prompt to save the password, that information will be
automatically deleted when the application closes. Passwords are only
saved when a user profile folder has been explicitly specified.