You can't put shortcuts out of its main box anymore. If you want so, you have to find and install a previous version and deactivate autoupdate and keep in mind that you must not update it !

What happened guys ? Why did you do that ?

Then I think https://addons.mozilla.org/fr/firefox/addon/google-shortcuts-all-google-se/ is better, even if it's obsolete and you have to manually adjust shortcuts URL.