Hi @Daniel Maher. I'm on Win 10, FF Dev 138.0b9, using DuckDuckGo as SE. I've had similar issues with other sites now and then, and sometimes the combination together with a few tweaked settings (which I sometimes forget about while using it as my go-to) seems to cause "weird-looking/behaving" issues once in a while. "Content blocking" was the cause in this case.
It's not a problem, but I was quite surprised to notice that the <div id="webinar-form-1"></div> remains completely "mute", even when I try finding the form elements using the dev inspector drill-down on my browser stack, till I noticed the warning and err rep about the reasons behind the apparent fail after inspecting it.
All sorted, I quickly completed the registration via Chrome yesterday.