Enable :
gnome-shell-extension-tool -e 'Current_screen_only_for_Alternate_Tab@bourcereau.fr'
Disable :
gnome-shell-extension-tool -d 'Current_screen_only_for_Alternate_Tab@bourcereau.fr'
Reload :
gnome-shell-extension-tool -r Current_screen_only_for_Alternate_Tab@bourcereau.fr
Look at errors with journalctl -f
Looking glass : ALT-F2 lg -> extensions -> show errors