problem starting mozilla in xfce4

[Klaus Neumann]

Hi,
I just installed mozilla 1.4 on my Gentoo system ("emerge mozilla"). It 
refuses to start in xfce4 (no problem in KDE and enlightenment!). Error 
message:
Error launching browser window:TypeError:
Components.classes['@mozilla.org/appshell/component/browser/instance;1'] 
has no properties

I hope you folks know what this means, because I have no clue.

-- 
Best regards,
Klaus