moz-version: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/moz-version - from package: mozilla-devscripts

You may install the required package with command apt-get install {package}
Error in other languages:
moz-version: bevel nie gevind nie
moz-version: comandă negăsită
moz-version: comando não encontrado
moz-version: commande introuvable
moz-version: command not found
moz-version: käsku ei ole
moz-version: không tìm thấy lệnh
moz-version: komanda nerasta
moz-version: Kommando nicht gefunden.
moz-version: kommandot finns inte
moz-version: komut yok
moz-version: nie znaleziono polecenia
moz-version: níor aimsíodh an t-ordú
moz-version: no se encontró la orden
moz-version: no s'ha trobat l'ordre
moz-version: opdracht niet gevonden
moz-version: parancs nem található
moz-version: perintah tidak ditemukan
moz-version: príkaz nenájdený
moz-version: příkaz nenalezen
moz-version: команда не найдена
moz-version: командата не е открита
moz-version: 命令找不到
moz-version: コマンドが見つかりません