Login Problems

I'm using a new Intel MacBook and cannot login to any Zoho product using the newest Firefox browser (2.0.0.4). In the login box I get an error message that the connection was reset (see image below). So there are never any input boxes to login. I can go to the direct link to my page, but just can't login to edit it. Is it a setting in my browser preferences? Is any other Mac users having this problem?

Here's the link to my page
creator.zoho.com/dclough/itrt-clough-lesson-request/

Here's the login error I keep seeing