Try from your phone browser or something instead, works fine on windows 11 here and on my iOS Safari Browser.
If all you want to do is opt out initially then maybe find a work around.
EDIT: I can get logged in by using 'private browsing' window of firefox, but still not 'normal' firefox window/tab
Possibly there is some Firefox plugin or extension which is active in normal mode but not in private mode. There are a few sites where I have to choose one of :