Secure Credit Card Numbers is a convenience launcher from the toolbar or Tools menu to launch the online virtual credit card programs available from Bank of America, Citibank and Discover. "Virtual Numbers" are intended to provide security by being only able to be used by one merchant, and therefore less risky than using your main number. Currently, these are the only three cards I'm aware of that support this feature. The launcher takes you directly to the online virtual card generators; no passwords are requested or stored by the program itself. You will need to have an online account with Bank of America, Citibank or Discover to make use of these virtual numbers. You may remove buttons and menu items you don't need in tools->add ons->extensions->securecc->options.