install xfce desktop with extra fonts using xdm login

1) setup package path.
# export PKG_PATH=ftp://ftp.openbsd.org/pub/OpenBSD/5.2/packages/amd64/

2) install xfce, firefox.
# pkg_add xfce firefox-i18n-en-US

3) copy extra fonts for X11.
# mkdir -p /usr/local/lib/X11/fonts/myfonts
# cp *ttc /usr/local/lib/X11/fonts/myfonts

4) edit non-root xsession for xfce startup.
$ vi .xsession
exec startxfce4

5) login xdm as non-root user. then you can browse non-English websites with Firefox on Xfce!

REFERENCE:
http://www.oesf.org/forum/index.php?showtopic=18833
http://www.openbsd.org/faq/truetype.html