I cannot get credit auto fill to work anymore. I have checked the settings and autofill is turned on.

Hello, to obtain more information about the autocomplete of credit cards in Firefox, go to the following article, which details the steps to activate or deactivate this function, or edit the saved credit cards. [[Automatically fill in credit card data on Web forms]]. I have also found this question similar to yours, I hope it can help you in something: https://support.mozilla.org/en-US/questions/1320107