hello, firefox cannot change the style of your mail account - it's just a browser & displays the content that is provided by a webserver. please contact yahoo's support in order to sort out the issue: http://help.yahoo.com/kb/index?page=product&locale=en_US&y=PROD_MAIL_ML

Yahoo won't change back to my Classic style. Maybe I'll go elsewhere.

Previous to 7/8/13 were able to return to Classic Mail by clicking Firefox Start > Otions > Content and then de-select Enable JavaScipt. Then go to mail.yahoo.com. This no longer works. Wish someone smarter than me could find a new path back. There are not enough 4-letter words to describe the new Yahoo Mail.

You have (1). no choice in accepting or declining the upgrade to the new e-mail and (2). you can not change back to their classic e-mail format. I received 3 notices via e-mail on my account (5/8/13 initial notice, 5/15/13 reminder notice, 6/5/13 final notice) all with a link in the e-mails to this page - http://www.att.com/latestmail which lands you on this page - http://www.att.com/esupport/article.jsp?sid=KB419290&cv=804

Applies to your Yahoo account as well.

Thanks OldFox. Yeah, saw a piece on TechCrunch.com. Yahoo now scanning ALL email to match advertisers with your perceived preferences. And of course bombard you with even more spam you can't stop. Guess that's why they are paying their new CEO $36M.