FIREFOX 4.0 causing checkout to fail - can anyone help? In the past 2 days, we have had many customers call who cannot move past the checkout page after they enter their credit card. They enter their card number, but when clicking the continue button nothing happens. The button is dead. In Firefox 3.0x it works fine. We did ask the customer yesterday what browser he was using - it was the latest Firefox 4.0 version. So we upgraded to Firefox 4.0 today, and yes - the continue button is DEAD in this version browser. This page continues to work in Firefox 3.0 and IE. We use Miva 4.12 with simple credit card validation. Thanks Bob