Capital One Visa credit card offers a great feature that protects its cardholders' credit card numbers. It's called "Eno." When a cardholder is making an online purchase, Eno activates and provides a virtual credit card number for the cardholder to use instead of his/her actual credit card number. It appears Firefox is not compatible with Eno. Has Firefox ever worked with Capital One Visa to make these two systems compatible? Thank you.