Disable account hub in Settings/General, then add the account from ≡ - New Account - Email (which includes a manual.config. option).

Thanks, it's not hanging now. I'm getting the "Edge: Too Many Requests" error from Yahoo, so I'm hopeful that if I try again tomorrow it'll allow me to link the accounts.

Disable account hub in Settings/General, then add the account from ≡ - New Account - Email (which includes a manual.config. option).

Thanks, this is what saved me : I had successfully installed various mailboxes but the last one (an ovh mail account), I never could until I deactivated "Account hub". 🙏

Thanks, it's not hanging now. I'm getting the "Edge: Too Many Requests" error from Yahoo, so I'm hopeful that if I try again tomorrow it'll allow me to link the accounts.

This has fixed it for many:

First, generate an app PW - see https://help.yahoo.com/kb/SLN15241.html.

Then go to TB menu > Account Settings > Server Settings and set the following:

- Server Name: export.imap.mail.yahoo.com - Port: 993 - Connection Security: SSL/TLS - Authentication method: Normal password

On the left column, scroll down and click 'Outgoing Server' and edit the Yahoo entry:

- Server Name: smtp.mail.yahoo.com - Port: 465 or 587 - Connection Security: SSL/TLS - Authentication method: Normal password

Finally, go to TB menu > Settings > Privacy & Security > Passwords

- click the 'Saved Passwords' button and edit the Yahoo entry to add your new app PW

After that's done, try logging in.

BTW, this fix is mentioned in the related [bug](https://bugzilla.mozilla.org/show_bug.cgi?id=1997062).

Thanks, once I set it to normal password, everything started working perfectly!