Safari can’t anymore open the page mail.yahoo.com

Hello,
I have an old PowerBook G4, Mac OS X Version 10.4.11, Safari 4.1.3
Since yesterday, Safari can’t anymore open the page mail.yahoo.com; the following message appears:
Safari can’t establish a secure connection to the server “guce.yahoo.com"
The same appears with Firefox 1.0.7
Would it be still possible with this old Mac to have access to my Yahoo email box by another mean?
Thanks for your attention.