Cannot Access Account
I also couldn't log in with FF#/email and password. Using the reset feature worked for me.
Turns out you now need uppercase/lowercase/numbers/punctuation/bloodoffirstborn etc.
Seriously this is madness! Club Carlson and Hilton are the same way. There is no logical reason why FF/hotel accounts I don't even use need stronger passwords than all of my bank accounts. I hope they all go out of business from people forgetting their convoluted passwords!