ext_localconf.php

<?php


$GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/class.t3lib_pagerenderer.php']['render-preProcess']['font-downloader'] = \WapplerSystems\FontDownloader\Hooks\RenderPreProcessorHook::class . '->renderPreProcessorProc';


if (!is_array($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['font-downloader'] ?? null)) {
    $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['font-downloader'] = [
        'frontend' => \TYPO3\CMS\Core\Cache\Frontend\VariableFrontend::class,
        'backend' => \TYPO3\CMS\Core\Cache\Backend\FileBackend::class,
        'options' => [
            'defaultLifetime' => 0,
        ]
    ];
}