Here's an interesting thing - I do keep Internet Explorer on my computer but rarely if ever use it. When I used I.E. to open Yahoo, the old page came up. There was a link on the old page to the new page, however. But for some reason, with Mozilla, I was automatically redirected to the new page - which didn't work - there was an error page that said Yahoo only supported I.E. and Firefox.
And even stranger - now Yahoo IS working on Mozilla - the new Yahoo, in fact. Must have been a start up glitch.