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Firefox won't let me save new Credit Card info

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I deleted a bunch of old credit cards (all except one)and tried adding a new one, but Firefox (for Windows) won't let me save a new credit card after I enter it. The Save button dims a sec to show the computer acknowledges it and no error statements pop up. FWIW The authentication security setting is off. Please help.

I deleted a bunch of old credit cards (all except one)and tried adding a new one, but Firefox (for Windows) won't let me save a new credit card after I enter it. The Save button dims a sec to show the computer acknowledges it and no error statements pop up. FWIW The authentication security setting is off. Please help.

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Use this setting to add, remove or change saved credit card data in Firefox. and select Settings. Click the Privacy & Security panel and scroll down to the Forms and Autofill section. Click the Saved Credit Cards

Regards, Will