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I've noticed that Firefox does not suggest previously used credit card numbers. For example, lets say I have an input field where user is supposed to enter a credit card number. If they enter anything else, the form submits, and if they focus on the field again, it suggest the previously entered value(s), but if they enter a valid credit card number, it is not suggested along with the other suggestions.

I appreciate the detail, since it adds a bit of security, but how is firefox doing that? Does it check all values on all input boxes to see if they seem like a credit card number, and if they do, avoid saving them for later suggestions? Can this behavior be deactivated? And lastly, is Firefox the only browser doing that?

Pascal Cuoq
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Buzu
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  • I think this is what you want: http://stackoverflow.com/questions/2530/how-do-you-disable-browser-autocomplete-on-web-form-field-input-tag – Rox Dorentus Nov 16 '12 at 19:53
  • List of browsers in this answer: http://stackoverflow.com/questions/3868299/is-autocomplete-off-compatible-with-all-modern-browsers – Erik Nedwidek Nov 16 '12 at 19:58
  • I'm guessing since other non-CC values are remembered in that field, none of the above links are applicable. Firefox probably filters '/[0-9]{15,}/' (any string of 15 or more digits) out of the list of things that are stored. – Jeff Ferland Nov 16 '12 at 20:56
  • Rox Dorentus, That is not really what I was looking for, but thanks for taking the time to reply. – Buzu Nov 17 '12 at 01:52
  • Erik Nedwidek, maybe the question is confusing, but I was not really looking for browser that support autocomplete, but for those that automatically filter CC numbers. Thanks for your answer though. – Buzu Nov 17 '12 at 01:54
  • Jeff Ferland, you are right, none of the answers were applicable. – Buzu Nov 17 '12 at 01:54

1 Answers1

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Firefox 4.0+ does scan for credit card numbers and if found it is not stored for autofill. I don't believe this can be deactivated.

As others have suggested there are ways to ask a browser not to remember a field for autofill but it's up to the browser to respect the request.

Brian
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