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<?php
function storefront_child_widgets_init() {
        register_sidebar( array(
                'name'          => 'Topmost Widget',
                'id'            => 'topmost-widget',
                'description'   => '',
                'before_widget' => '<aside id="%1$s" class="widget %2$s">',
                'after_widget'  => '</aside>',
                'before_title'  => '<h1 class="widget-title">',
                'after_title'   => '</h1>',
        ) );
}

add_action( 'widgets_init', 'storefront_child_widgets_init' );

function storefront_child_social_icons() {
	dynamic_sidebar( 'topmost-widget' );
}

add_action( 'storefront_header', 'storefront_child_social_icons', 40 )