Adobe Connect vs Firefox - firefox seems to be winning

As of last week, when running an Adobe Connect meeting via Firefox, I could no longer use the "Manage Meeting Information" function. A tiny blue circle would very briefly spin and then nothing would happen.

As of tonight, I can't even open a Connect room via Firefox.  When I try to do so, the meeting room very briefly (i.e. less than a second) opens, then auto-closes.

I know that the room is actually opening/I'm actually joining it, because when I entered the room I wanted via Chrome 15 seconds later, I was logged in as "Stuart Kovinsky 2" - in other words, I managed to briefly join the meeting before my room window closed.

I'm not getting any kind of pop-up blocker warnings in firefox and have not recently changed any of my settings.

System info:

Windows 10, 64 bit

Firefox 56.0.2 (64-bit)

Adobe connect add-in

OK - update: I wondered "hey, self, wouldn't you feel silly if you just needed to resintall the add-in?"  So, I reinstalled the add-in.

Now, instead of the window opening and immediately closing, I get a small "Loading Adobe Connect" window. However, after 1 minute and counting, I still just have a small "Loading Adobe Connect" window.

I then tried to open the room with ?launcher=false added, and the room did open inside Firefox. So, the problem appears to be with the add-in.

I can also access "Manage Meeting Information" when I don't use the add-in.

Any help would be greatly appreciated!