VirtualBox Guest Additions provide closer integration between host and guest, and improve the performance of guest systems. Non-legacy additions i.e. emulators/virtualbox-ose-additions are recommended for most use cases. Where legacy (5.2.x) is a requirement, this FreeBSD-provided package can be installed in the FreeBSD guest machine. emphasises that 5.2.x is no longer supported by Oracle. Additions are not intended for use on Host machines.