overlay/etc/systemd/system/xinit@.service

@@ -2,8 +2,8 @@
 Description=Start X.org for user %I
 Wants=network-online.target
 After=network-online.target
-Wants=time-set.target
-After=time-set.target
+Wants=time-sync.target
+After=time-sync.target
 
 [Service]
 Type=simple

overlay/home/user/.xinitrc

@@ -3,5 +3,5 @@
 xset s off
 xset -dpms
 systemctl --user import-environment DISPLAY
-systemctl --user start firefox-marionette.socket firefox
+systemctl --user start firefox-marionette.socket
 exec openbox