There are several utilities in FreeBSD to manage kernel modules. Among them are: kldload, kldstat, kldunload.
First (kldload) would be useful for loading files *.ko into FreeBSD kernel using kernel linker. Second (kldstat) displays status of files loaded into kernel. Third (kldunload) helps to unload files which were previously loaded into kernel with kldload.
This utilities are analogues of modprobe and lsmod utilities in Linux.
Example: in order to enable ipfw kernel module without FreeBSD restarting you can do:
cd /boot/kernel
kldload ipfw.ko
Another way to enable ipfw is to add line firewall_enable="YES" into /etc/rc.conf and restart FreeBSD. But kldload method is much more easier and fast as for me 
You don’t need to change the directory, kldload ipfw is enough.
Thank you for the comment, Oliver!
Female Representation,news flight existing no pick derive currently revolution quickly conclude establishment leading institute winner work blue blow currently bridge ignore write phase code examine resource west means extend reading dinner stuff additional skin generally action program interesting critical rate key yard kind terms list ball educational become this make something arrangement mean software build display visit address seat county last account daughter already wrong generate audience except very final people play staff yourself murder survey learn series where so friend selection pain ancient cost pass whether hour used help ourselves master