Firefox broswer 3.01 cannot open Yahoo email

My firefox browser on my Acer Aspire 2920 laptop have strange error.
The Yahoo mail got the following error when I login:

Strange that my FireFox browser is the latest version. Just wonder why it cannot run properly. I did tried to uninstall firefox and reinstall firefox 3.01, still the same problem.

I used IE 7.0 and it was okay. Software problem? I got no idea at all.