I cannot login to stackoverflow.com. I am still logged into stackexchange, academia and meta (I haven't logged out). The problem resembles Login process incompatible with Adblock Plus ("the login process just spins forever and doesn't continue.") but I have disabled Adblock and it will still not work.
On an Ubuntu Firefox I disable ABP, ghostery and the enter my email and password at https://stackoverflow.com/users/login and press "Log in" and then nothing happens. No error message.
Ubuntu Google Chrome neither works.
If I press the Google or Facebook link nothing happens, and the orange "Google" part of the button is misaligned, - and so is the Facebook button.
I am presently logged out of askubuntu. There the buttons are well-aligned and at one point responsive. The login doesn't work however.
I see a single error message with F12 and the console for askubuntu:
Firefox can't establish a connection to the server at wss://qa.sockets.stackexchange.com/ that might be relevant