I've just tried loading
https://www.flyertalk.com/forum/usercp.php on an iPad (iPadOS 14.0, Firefox 28.2 (2470)).
The TrustArc / TRUSTe component appears to load fully, but is dead -- i.e. none of the options can be selected or changed and the page as a whole cannot be submitted/saved.
The iPad was 'clean' -- advertising identifier reset and Firefox cookies etc. cleared. My IP address indicated (correctly) that I'm in Germany.
If I use just "flyertalk.com" as my starting address, the overlay functions as intended.