In 1.3 you can show a specific firewall group
vyos@r4:~$ show firewall group Possible completions: <Enter> Execute the current command FOO Show IPv4 firewall group FOO2
1.4 it is impossible:
vyos@r11-roll:~$ show firewall group Possible completions: <Enter> Execute the current command vyos@r11-roll:~$ show firewall group FOO Invalid command: show firewall group [FOO] vyos@r11-roll:~$