ext_tables.php

<?php
if (!defined('TYPO3_MODE')) {
    die ('Access denied.');
}

if (TYPO3_MODE === 'BE') {

    /**
     * Registers a Backend Module
     */
    \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerModule(
        'FBIT.TSLive',    // Extension-Key
        'tools',     // Make module a submodule of 'tools'
        'tslive',    // Submodule key
        '',                        // Position
        [
            'LiveEditor' => 'index',
        ],
        [
            'access' => 'user,group',
            'icon' => 'EXT:' . $_EXTKEY . '/ext_icon.gif',
            'labels' => 'LLL:EXT:' . $_EXTKEY . '/Resources/Private/Language/locallang_tslive.xml',
        ]
    );

}

\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile($_EXTKEY, 'Configuration/TypoScript', 'TSLive');
?>