How to use firmware search path? (e.g. `/mnt/data/supervisor/share/firmware`)

Answer (sorry in case it was not obvious before):

https://github.com/OpenELEC/dvb-firmware/raw/master/firmware/dvb-usb-it9303-01.fw
https://github.com/OpenELEC/dvb-firmware/raw/master/firmware/dvb-demod-si2168-02.fw
https://github.com/OpenELEC/dvb-firmware/raw/master/firmware/dvb-demod-si2168-b40-01.fw