It is possible that Firefox has resend a form or cookies to that server after reloading the tabs following the restart after that crash. It is possible that the server has interpret that as a new request. Firefox doesn't store POST data as part of session restore (but may have kept already filled form data), so I'm not sure that this is entirely Firefox fault. The server should have asked for confirmation.

Thanks for the feedback. I really can’t recall another information box/prompt appearing to confirm after the credit card# page. After CC# page, it processes & you get an invoice# screen. Thanks again for the response.