Locked out, invited to not come in

This is the second time that I have spent hours trying to return to the last page I was reading. I think both times may have been when upgrading Firefox, keeping the old version open to extract website addresses from and copy and paste them into the new version. When I do, my Discord account does not allow me to log in. Instead I am connected with the same screen name but a different user ID number. There are flags all over telling me I can't post until I claim the account. Once I click on one of the many buttons to claim, or equivalently simply try to connect to Discord, I am given an Invite to use my old screen name. Just enter my email and password. At which point the invite is rejected because someone already is using that email address, namely ME. But there is no way out of that screen accept to make up a new email address and password. I frequently went back and forth between the old browser and the new trying to find the magical way to become me. I finally saw the logout on the settings menu of the old browser, and after that I was suddenly able to see a login screen, not the invite and reject black hole. I am assuming that you don't want a single account open in two places at once. A button on the bottom of the black hole page allowing you to close the open session while logging in to the new session using your password and email would seem a small price to pay to keep each account with only a single active connection. And if you run into the other mishabear be careful, he has not had his 3 month nap yet and he is getting a bit growly.

Mike