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how do I remove credit card numbers that drop down from a menu?

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when I am asked for my credit card number on websites where I pay my bills, usually one or two numbers previously entered appears when the first number is entered. Some of those numbers are inactive. Is there a way to remove one or more numbers? I understand it is a browser problem.

when I am asked for my credit card number on websites where I pay my bills, usually one or two numbers previously entered appears when the first number is entered. Some of those numbers are inactive. Is there a way to remove one or more numbers? I understand it is a browser problem.

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Firefox 4, to be released next year, shouldn't store credit card numbers anymore by performing a check.

Bug 188285 – Form autocomplete should not store credit card numbers