Extension is broken guys. Can't login, can't logout once logged in, and so you can't change anything. Everything works only a single time once you uninstall/reinstall the extension. But once you log in and make your selections, it reverts to its broken state the next time you start the Firefox browser.
NordVPN, you need to spend less on ads and more on development, because ultimately it's the users who will determine whether or not to keep using (ie. $$$PAYING FOR$$$) your service.