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VirtualBox was installed.

You need to load the vboxdrv kernel module and a mounted /proc filesystem.

% mount -t procfs proc /proc
% kldload vboxdrv

You also have to add all users to your vboxusers group in order to use vbox.

% pw groupmod vboxusers -m jerry

Running VirtualBox as non-root user may fail with a fatal error 
NS_ERROR_FACTORY_NOT_REGISTERED. In this case delete /tmp/.vbox-*-ipc file.

Please report any problems to emulation@. Thanks!

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