Same here. I refuse to use Chrome, and currently sitting here from the latest MS Edge. From mozilla it just shows my login info already in place, my nick, e-mail, everything set up, but when logging in it just refreshes and doesn't do anything, remains the same before I licked log-in.
I can't log in from Mozilla at all here, works everywhere else fine, but not here. Tried multiple options, no results. Cleared cache and other stuff with CCleaner, still nothing.
I have customized security settings and thus, I have no idea which should I switch off or change for this to work, I am not even sure if this is related to it at all or something mozilla related in general, and I wont re-install it because of it. Almost a year ago I installed new win and everything from a new because I did a fresh ground up build. I couldn't log-in here from Mozilla even before. I remember I once could, but it was long time ago, measured in years.
I can log in from mozilla if I restart it in safe mode, but then it completely removes everything necessary for my daily browsing.
UPDATE: I found a culprit... I have to constantly turn off my AdGuard extension when I want to log in the forum on cdpr page, even if I whitelisted CDPR every page it still didn't allowed until I went and disabled it through extensions, since turning it off doesn't work either through the icon, it has to be through extensions.