$firefox
Reading profile /etc/firejail/default.profile
Reading profile /etc/firejail/disable-common.inc
Reading profile /etc/firejail/disable-passwdmgr.inc
Reading profile /etc/firejail/disable-programs.inc

** Note: you can use --noprofile to disable default.profile **

Parent pid 18480, child pid 18481
Child process initialized in 32.34 ms
/bin/bash: /usr/bin/firefox: Permission denied

Parent is shutting down, bye...