Guys, I was unable to install it with X and GNOME on virtualbox. Can someone share the working virtualbox snapshot of FreeBSD 10 along with X and GNOME on it so that noob linux users like me can try.
https://forums.freebsd.org/viewtopic.php?&t=28804
In Vbox:
Right click on the VM to edit...
Settings > System > Extended Features: Enable IO APIC