Appimage doesn’t run in Firejail. Firejail is sandbox in Linux.
Please have a look:
Is it possible for you to check it, please.
Also I would like to be able to run it with Firejail option
I would like to run it in
That creates fake /home.
I use Manjaro, so unpacked deb file and I was able to run it from command line with Firejail but not with --private option.