http://www.maniacsolutions.com/yahoo-marketing-solutions-account/

Yahoo! Does not work in any Mac browser?
I found that for the last week of Yahoo! No longer works on any Mac browser The Yahoo! Home works fine, but as soon as you try to go to the post, you get a blank page is loaded continuously, but never reaches the mail screen. With Safari, an error message indicating that the browser crashes appears. I've also tried Netscape through despair that does not work. I tried this on three Macs, and various browsers, as well as two different Yahoo! Auditors. Is there a solution for Mac users than other services such as sign Googlemail? If not, then I'm sad to see Yahoo! Take this approach is not compatible with a rapidly growing market.
Kerio Personal Firewall and other firewalls appears to disrupt Yahoo! mail capacity to function properly. For Yahoo! Mail Beta to work on your system, you must make it one of the exceptions KPF site. Here's how: Double-click the Kerio Personal Firewall icon to open the firewall configuration. Click the Web tab on the left. Exceptions on the site tab, click the Add button and enter *. mail.yahoo.com server address www. Yes, you read right, an asterisk, followed by a period the post-dot-yahoo-dot-com. Click "OK." Click "OK" to save and close the configuration. You can now use Yahoo! Beta while using Kerio Personal Firewall and other firewalls.
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