<ul>
<?php
$tags = get_tags(array(
    'number' => 10,
    'orderby' => 'count',
    'order' => 'DESC'
));

if ($tags) {    
    foreach ($tags as $tag) {
        $tag_link = get_tag_link($tag->term_id);
        echo '<li><a href="' . esc_url($tag_link) . '" target="_blank">' . esc_html($tag->name) . '</a></li>';
    }
}
?>
</ul>