Hi Josue,
thank you, worked for all browsers but FF. But I could resolve it this way:

#tab-upsell_tab:empty, #tab-upsell_tab:-moz-only-whitespace {
background: white none repeat scroll 0% 0% !important;
height: 30px !important;
position: relative !important;
top: 0px !important;
z-index: 10 !important;
}

Regards
Wolfram

I solved it with this code in the functions.php. The upsells/”you may also like” section than is in a tab:

/* Upsell Hook */

// Remove the WooCommerce Upsell hook
remove_action( 'woocommerce_after_single_product_summary', 'woocommerce_upsell_display', 15 );

// Add a custom action to display Upsells
add_action( 'growdev_after_single_product_summary', 'woocommerce_upsell_display', 15 );

if ( ! function_exists( 'woocommerce_output_upsells' ) ) {
	function woocommerce_output_upsells() {
	    woocommerce_upsell_display( 10,5 ); // Display 10 products in rows of 5
	}
}

// A filter to add a custom tab
add_filter('woocommerce_product_tabs','growdev_add_tab');

// Callback for add_filter that defines the filter. You can change 'New tab' to the desired
// tab title
// growdev_custom_tab is the function callback
function growdev_add_tab( $tabs ) {
	$tabs['upsell_tab'] = array( 'title' => 'Passende Produkte:', 'priority' => 29,
								 'callback' => 'growdev_custom_tab');
	return $tabs;
}

// The function callback for the custom tab.
// This does the display upsells action inside of the tab
function growdev_custom_tab( $key, $tab ) {

	do_action('growdev_after_single_product_summary');

}

Little problem: the tab title stays there even if there is no upsell product. Do you have a solution for that?

Hi Josue,

pls. see private content

Regards
Wolfram

Just to make it clear: I have no tabs on my product page. But nevertheless the “You may also like”/Upsells section should be above the position where the tabs normally are ;-) It should be on the left of the sidebar, not under the sidebar.

Thank you ;-)