diff --git a/ecoleA/config-computer.sh b/ecoleA/config-computer.sh
index 0671513..a1aa20d 100644
--- a/ecoleA/config-computer.sh
+++ b/ecoleA/config-computer.sh
@@ -1,6 +1,40 @@
 #!/bin/bash
+
+# Test du user ROOT
+if [ "$EUID" -ne 0 ]
+  then echo "Please run as root"
+  exit
+fi
+
+# Chargement du clavier Français
 loadkeys fr
 
+# Modification des droits sudo
 USER_DO=aoste
 echo "$USER_DO ALL=(ALL:ALL) NOPASSWD:ALL" | sudo tee /etc/sudoers.d/010-$USER_DO-nopassword
 
+# Firefox : suppression du snap
+snap remove firefox
+dirName=~/snap
+# Firefox : suppression des paramètres
+if [ -d "${dirName}" ]; then
+  cd "${dirName}"
+  dirName=~/snap/firefox
+  if [ -d "${dirName}" ]; then
+    rm -r "${dirName}"
+  fi
+fi
+# Firefox : ajout de la référence PPA
+filenameEdit=/etc/apt/preferences.d/firefox-no-snap
+if [ ! -f "${filenameEdit}" ]; then
+  echo "Package: firefox*" | tee "${filenameEdit}"
+  echo "Pin: release o=Ubuntu*" | tee -a "${filenameEdit}"
+  echo "Pin-Priority: -1" | tee -a "${filenameEdit}"
+fi
+# Firefox : installation
+apt purge firefox
+add-apt-repository ppa:mozillateam/firefox
+apt-get update
+apt install firefox
+# Firefox : Unattended-Upgrade
+echo 'Unattended-Upgrade::Allowed-Origins:: "LP-PPA-mozillateam:${distro_codename}";' | sudo tee /etc/apt/apt.conf.d/51unattended-upgrades-firefox