Anyone unable to log in to forum with Firefox?

[DaveInSA]

When I click login, I get the username and password prompt. I submit, it goes away and I just get dumped back at the page I was on, not logged in. It never prompts for my 2fa.
I've completely reset firefox and deleted all history, cookies, saved everything, addons, etc. Still does it. Tried turning firefox's internal dns stuff on and off. Nothing helped.

I have to log in with *shutter* Microsoft Edge... which works fine

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[DaveInSA]

Ok, this is starting to get really annoying. I have an instance of Firefox that's logged in.
However, I'm unable to log in with Edge or Opera browsers.
I click login, I put in my details, I click "Log In" and the page reloads to the home page of bronco6g.com and I'm not logged in. No errors or anything.
Both browsers are completely reset to stock settings. There are no extensions installed at all. Even tried adding the site to all exceptions for everything.
Anyone know of some way to even find an error message of whats going on?