Index: wp-admin/network/site-info.php
===================================================================
--- wp-admin/network/site-info.php	(revision 16600)
+++ wp-admin/network/site-info.php	(working copy)
@@ -82,6 +82,7 @@
 <?php
 $tabs = array( 'site-info' => array( 'label' => __('Info'), 'url' => 'site-info.php'),  'site-options' => array( 'label' => __('Options'), 'url' => 'site-options.php'),
 			  'site-users' => array( 'label' => __('Users'), 'url' => 'site-users.php'),  'site-themes' => array( 'label' => __('Themes'), 'url' => 'site-themes.php'));
+$tabs = apply_filters( 'edit_site_tabs', $tabs );
 foreach ( $tabs as $tab_id => $tab ) {
 	$class = ( $tab['url'] == $pagenow ) ? ' nav-tab-active' : '';
 	echo '<a href="' . $tab['url'] . '?id=' . $id .'" class="nav-tab' . $class . '">' .  esc_html( $tab['label'] ) . '</a>';
Index: wp-admin/network/site-options.php
===================================================================
--- wp-admin/network/site-options.php	(revision 16600)
+++ wp-admin/network/site-options.php	(working copy)
@@ -70,6 +70,7 @@
 <?php
 $tabs = array( 'site-info' => array( 'label' => __('Info'), 'url' => 'site-info.php'),  'site-options' => array( 'label' => __('Options'), 'url' => 'site-options.php'),
 			  'site-users' => array( 'label' => __('Users'), 'url' => 'site-users.php'),  'site-themes' => array( 'label' => __('Themes'), 'url' => 'site-themes.php'));
+$tabs = apply_filters( 'edit_site_tabs', $tabs );
 foreach ( $tabs as $tab_id => $tab ) {
 	$class = ( $tab['url'] == $pagenow ) ? ' nav-tab-active' : '';
 	echo '<a href="' . $tab['url'] . '?id=' . $id .'" class="nav-tab' . $class . '">' .  esc_html( $tab['label'] ) . '</a>';
Index: wp-admin/network/site-users.php
===================================================================
--- wp-admin/network/site-users.php	(revision 16600)
+++ wp-admin/network/site-users.php	(working copy)
@@ -155,6 +155,7 @@
 <?php
 $tabs = array( 'site-info' => array( 'label' => __('Info'), 'url' => 'site-info.php'),  'site-options' => array( 'label' => __('Options'), 'url' => 'site-options.php'),
 			  'site-users' => array( 'label' => __('Users'), 'url' => 'site-users.php'),  'site-themes' => array( 'label' => __('Themes'), 'url' => 'site-themes.php'));
+$tabs = apply_filters( 'edit_site_tabs', $tabs );
 foreach ( $tabs as $tab_id => $tab ) {
 	$class = ( $tab['url'] == $pagenow ) ? ' nav-tab-active' : '';
 	echo '<a href="' . $tab['url'] . '?id=' . $id .'" class="nav-tab' . $class . '">' .  esc_html( $tab['label'] ) . '</a>';
Index: wp-admin/network/site-themes.php
===================================================================
--- wp-admin/network/site-themes.php	(revision 16600)
+++ wp-admin/network/site-themes.php	(working copy)
@@ -105,6 +105,7 @@
 <?php
 $tabs = array( 'site-info' => array( 'label' => __('Info'), 'url' => 'site-info.php'),  'site-options' => array( 'label' => __('Options'), 'url' => 'site-options.php'),
 			  'site-users' => array( 'label' => __('Users'), 'url' => 'site-users.php'),  'site-themes' => array( 'label' => __('Themes'), 'url' => 'site-themes.php'));
+$tabs = apply_filters( 'edit_site_tabs', $tabs );
 foreach ( $tabs as $tab_id => $tab ) {
 	$class = ( $tab['url'] == $pagenow ) ? ' nav-tab-active' : '';
 	echo '<a href="' . $tab['url'] . '?id=' . $id .'" class="nav-tab' . $class . '">' .  esc_html( $tab['label'] ) . '</a>';