In r94451, when using Yahoo! Mail, clicking sidebar links, such as Inbox and Spam do not trigger the expected behavior (opening said folder).
This was working for me as of 4 nighties ago. If requested I'll find out which nightly it broke in.
1. Go to mail.yahoo.com
3. When the interface loads, attempt to click the Inbox in the left sidebar
Regression range r94444-r94448, meaning that it's http://trac.webkit.org/projects/webkit/changeset/94445 (Use bump allocator for initial property storage).
That patch has been rolled out in http://trac.webkit.org/changeset/94522, so the problem should be fixed in current nightly.