here is another way… on the main interface pres F1 to access the file manager, on the left side choose applications and open flatpak-config, it will populate a list of available applications to install on batocera, select firefox then install on the right side, after installation, open Xterminal, and type batocera-flatpak-update… and BOOM, firefox is installed on Ports, and for the audio to work, reboot the system because the audio wont work after opening firefox, it will only work after the reboot