plausible_analytics/ext_localconf.php

<?php

if (!defined('TYPO3')) {
    die('Access denied.');
}

call_user_func(function () {
    $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_pagerenderer.php']['render-preProcess'][] = \MMK2410\PlausibleAnalytics\Hooks\PageRendererPreProcess::class . '->addLibrary';
});