@Toes I have the real reason!
I tried to donate and the recurring webpage won't render in browser or desktop Firefox.
Also it is in Euro's with no information on what that is in your local currency.
Lastly I haven't heard of a single bank in the list of direct debit list.
Basically I think they've made it too hard for UK/USA/RoW to donate.
@Bro666 yes the issues is in the Donerbox element.
It doesn't resize on Firefox and there aren't embedded scrollbars. So when you get to the 3rd screen you can't progress
Issue affects desktop and mobile versions of Firefox.