Can't read yahoo mail

Starting tonite, I can not get to my yahoo mail.
I am using Seamonkey.

When I click on Continue using Classic mail, nothing happens.

It gives this message.

No one replied, so I really go to work.

Yahoo has made it so Seamonkey no longer works with Yahoo mail.

I like SM much better than Firefox because it lets you edit html files.

Found an addon called PrefBar for Seamonkey.

It lets you change the useragent.

I changed it to FF 58 and now I can read my mail.

Any Seamonkey users here?

I think you need to be yahoo premium for that to work, IIRC.
sorry I couldn’t be more halp.

Reread my post.

I used PrefBar.

Yahoo wants only certain browsers to work with Yahoo mail. (like Firefox,Chrome,IExplorer)

PrefBar lets you change the useragent string to another browser.

I am using Seamonkey now, but with PrefBar, sites think I am using Firefox 58.

Andy