Virtual credit card

Privacy is a browser extension that generates a virtual credit card for each online purchase you make. It offers different options when you create a virtual card — you can make a one-time-use card, a card with a limit (so that it expires once a certain amount is spent), or other kinds of limits. This seems like a great way to protect yourself from getting scammed by one of those sites that trick you into unwittingly signing up for a nearly-impossible-to-cancel monthly fee for something. — MF