That is strange. I've tested the login with my laptop windows 10, all browsers (firefox, opera, edge, chrome), my kids PC windows 10, (same browsers), wifes laptop windows 10, (same browsers), my kids ipad mini, my cell phone (android) and they all go to the same place to log in.
It's possible they maybe testing out a new log in system for all the sites and are redirecting people randomly, I don't know. They don't communicate with us volunteer admins on changes like that unless we ask about it.
What version of windows is on the PC with firefox you are trying to log in with?
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