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how does firefox know to fill in my credit card details in a webpage? i don't like it to keep them on file.

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how does firefox know the details of my credit card to fill in a web form.? how can I prevent firefox from keeping a copy of my credit card numbers?

This happened

Not sure how often

== i previously filled in the same web page a month ago.

how does firefox know the details of my credit card to fill in a web form.? how can I prevent firefox from keeping a copy of my credit card numbers? == This happened == Not sure how often == i previously filled in the same web page a month ago.

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