A lot of systems seem to silently fail on Firefox - my broadband supplier's website failed at the last step of the onboarding process. I managed to get charged for installation (connection by the network operator, UK) twice, have onboarding emails sent, but not have the appointment in my account.
Used Edge, went through completely.
Can't guarantee it was Firefox/browser issues. But this is not that uncommon an occurrence.
I suspect it is the bank who are at fault.
Do you have adblock by any chance?
Just today Ryanair wouldnt let me in on Firefox. 403 with a cloudflare error.
But on chrome it went through without a hitch.
I’ve been using Firefox for 20 years, and Ryanair for 10, I’ve never had to switch browser for it. My last flight was 2 weeks ago
Its the magic of multi-metric based DDOS/exploit/whatever protection.
For my full profile the login attempt with Firefox as a user agent apparently pushed it over the edge.