I just found out about a Paypal feature that I never knew existed! I really can?t believe I?d never known about this before. You can download a plugin for firefox/IE which allows you to generate a temporary mastercard (mastercard gift card). Basically you want to pay for something which cost $50 but the place only takes credit cards, not Paypal.. no problem, this will generate some mastercard credit card details that will use your Paypal balance. Extremely useful! If however you?re one of the people using Mac OS X.. Mac users cannot install the PayPal Plug-In at this time. However, you can still use the Secure Cards feature of the plug-in. How it works: * Go to the Secure Cards page. * Generate a unique MasterCard Secure Card number. * Note the card number, expiration date, and the CVC2. * Enter these details at checkout.