I use Thunderbird to read my email from Yahoo when it is convenient. I have 3 accounts with Yahoo. They use to all work fine reading in the messages. Now my crazyforcountry@yahoo.com account does not work right. When it was reading in my mail, it would freeze in the read process before finishing. Next try would read the same messages and freeze before finishing, so Yahoo messages did not go to the trash. I tried to make a new Thunderbird account, and not use the old one thinking something is wrong with the old account. Making a new account did not work because Yahoo would not accept my username for connecting to my Yahoo mail, so I got nowhere.
Now I can't get my troubled account to login to Yahoo mail even though I can login to it via Browser.
Please look into this. I spent much time trying to straighten this out. I don't think it is Thunderbird because my other 2 accounts have no issues login in and read my mail.