If I got to http://www.apple.com/imac/ or any page that starts a video (and I hate those sites!) Firefox pulls up FireFox and then crashes with above errors messages. I have KDE 3.5.1. Maybe I need to upgrade.
This is why I hate Windows and Linux sometimes. It's never 100%. Only OS-X seems to work on everything all the time. I don't know why.
I'm up to KDE 3.5.3 - this may be the reason. Although the URL you are having problems with works with me, I get a similar error if I try and connect to www.eatsleepsport.com.