It works for me. What happens when you try?

Works for me - W10; Fx44. If you are a customer you could try starting here - https://client.schwab.com/Login/SignOn/CustomerCenterLogin.aspx

Standard procedure would be to try clearing cache and relevant cookies.

Thanks to both Fred and Alan!

Alan's suggestion of clearing the Cache and the Cookies both helped solve the problem right away.

(Fred - To answer your question - the site just wasn't loading. It just sat there with a blank screen and there were no error messages of any kind. Perhaps Firefox can help this by at least providing some message ?)