Change it in Systemsettings. I use konsole-4.3.1 with kde-3.5.10 and
after the change it opens firefox for me.


What all do you unmask for this?  I'm still kicking around 3.5.10, but I wouldn't mind some updated apps, and some of the new Konsole features sound useful (which is ironic, since they were laid out as to why there aren't differences from 3.5.10...)

Of course I wouldn't mind Okular either, but I think this needs the full kde4 libraries.

~daid