From the #FreeBSD mailing lists for all #laptop users out there:
"Before updating your system please run #fwget(8) or build
wifi-firmware-iwlwifi-kmod (or the appropriate flavor) from ports if you
are using #iwlwifi(4) or #iwx(4).
You can do it any time as the extra firmware files will do no harm until
your next reboot at least."