Thunderbird 153 can use the browser to log in to the account. It would be useful if we can do that to log in in Thundermail too. When I went to Settings > Thundermail, I had to log in, but since it wasn't in the browser but a tab in Thunderbird instead, I had to copy paste my password. It would be nice to open the login page in the browser so people could use password managers and, in the future, MFA.