firefox doesn't work on amd64

[Meka[ni]]

uname -a says: FreeBSD hal9000 6.0-BETA1 FreeBSD 6.0-BETA1 #2: Thu Jul 28 04:03:17 CEST 2005     root at hal9000:/usr/obj/mnt/atom/home/src/sys/HAL9000  amd64
firefox (version 1.0.6_1,1) says: (firefox-bin:2880): Gdk-WARNING **: gdk_property_get(): length value has wrapped in calculation (did you pass G_MAXLONG?)

Any idea about this? Version 1.0.6 worked just fine.