Verifico in front-end o in backend se è o meno attivo un plugin
From https://pippinsplugins.com/checking-dependent-plugin-active/
<?php
//in backend
if( is_plugin_active( 'plugin-folder/main-plugin-file.php' ) ) {
// Plugin is active
}
//in frontend
include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
if( is_plugin_active( 'plugin-folder/main-plugin-file.php' ) ) {
// Plugin is active
}