ffe80540/uninstall.php

<?php
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) exit;
global $wpdb;
$wpdb->query( "DROP TABLE IF NOT EXISTS {$wpdb->prefix}ffe80540" );
delete_option( 'ffe80540_options' );
delete_option( 'ffe80540_db_version' );