Launching firefox and timeshift in background and not stopping the installation script

install.sh

@@ -48,10 +48,10 @@ pkill xfconfd
 rm -rf $HOME/.config/xfce4/panel/
 rm -rf ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-panel.xml
 ln -sf $(pwd)/config/xfce4/panel/ $HOME/.config/xfce4/
-xfce4-panel
+xfce4-panel &
 
 echo "Configuration de timeshift"
-sudo timeshift-gtk
+sudo timeshift-gtk &
 
 echo "Configuration du système"
 sudo tee -a /etc/fstab << EOF