Cannot enter card details into payment form

Hi everyone, wonder if you can help with a problem I have on website form I wanted to support a project on kickstarter and was unable to enter my card details into the website form Only the 'Cardholder Name' field was available, all others greyed out Kickstarter support suggested it must be the Firefox browser and encouraged me to use Chrome. I could not find any help on the Mozilla support site, and I do not think Chrome is particularly good at users security so I loaded Vivaldi and to my surprise everything worked OK I assume I must have a security setting somewhere in Firefox that is blocking the Kickstarter site for some reason and wonder if anyone has any ideas? I do not get any problem with "usual" websites like shopping sites, ebay etc. Windows 10 Intel & Nvidia Kaspersky Internet Security (Tried with Kaspersky Disabled) Firefox 63.0.3 64bit Any help gratefully appreciated Regards to all TW