I was able to create my account on Firefox Quantum 61, but when I went to log in after I was confirmed, it failed and I got a "Cookies are required to log in to this site. You will not be able to log in until they are accepted" message. I checked my options, and Firefox is accepting all cookies, and this site is not blacklisted. I am getting notices from Firefox that logins are not secure, so that may be something to note. I am able to login on Microsoft Edge, however.