There are docker images that include firefox as a base build, which you would then add HA core to. You could extend this to incorporate firefox running in the same container - or another - but the former is easier.

Note the privileged and network_mode - potential “risks” but I use them with care. You can disregard the Z-Wave controller - I threw it in as an example. Then it would just be a case of docker-compose -f $/docker-compose.yaml up home/xyz/homeassistant/CONFIG:/config #-REPLACE xyz with your HA install directory Image: homeassistant/raspberrypi3-homeassistant:stable I tend to use docker-compose and this would get you up and running with HA core in a container on top of Raspbian (or Pi OS as I believe it is called now). Several ways to achieve this but an imported container volume is an option, but so is firefox in another container with both containers accessing the host. Again, +1 with core would be my preference in this situation, with a slight modification: I would run HA core in a container and incorporate firefox in the container also.

Install mozilla firefox on raspbian