There is a decision by the site to exclude certain browsers. Can you contact the site and tell them that Firefox for iOS is based on Safari -- like all browsers on iOS -- and has different version numbering from Firefox for desktop systems. Hopefully they'll update their scripts to allow Firefox again.

So to clarify, you’re saying it is America’s Voice that is doing the blocking and not FireFox?

Yes, they're doing it (perhaps unintentionally).

Hmmm! I’m not sure it’s unintentional because it stopped working in Brave on the same day. The Brave error messages states that the site works in Safari so it seems someone who knew about the issue actually had to post that message.