Meta Box for Admin Only

So I wanted to make the back end meta boxes only available for administrators, so that way Editors (and lower roles) could not inject code into the header and footer. I found a very easy solution for this that I wanted to share with everybody. Open up ehfi-init.php and on line 53, where it says:
add_action( 'add_meta_boxes', 'nlws_ehfi_add_meta' );
change it to say:

if (current_user_can('manage_options')) {
add_action( 'add_meta_boxes', 'nlws_ehfi_add_meta' );
}

The second step, and this is equally important, is to add this line of code to the top of the page (below the plugin notes is fine):
require_once(ABSPATH . 'wp-includes/pluggable.php');

And that’s it!

If the developer is reading this, can that somehow be made as an option in future versions?

Thanks!

https://www.ads-software.com/extend/plugins/enhanced-header-footer-injections/