wp_print_active_plugins.php

<?php 
/*
 *	Print a list of active WordPress Plugins. 
 *  Put this in a template file you can see or hide it and use DevTools to view it. 
 *  Useful for troubleshooting perfomance problems in sites with many plugins.
 */

	// Check if get_plugins() function exists. This is required on the front end of the
	// site, since it is in a file that is normally only loaded in the admin.
	if ( ! function_exists( 'get_plugins' ) ) {
		require_once ABSPATH . 'wp-admin/includes/plugin.php';
	}

	// Get an array of all plugins.
	$all_plugins = get_plugins();
	
	echo '<pre>';
	
	// If a plugin is active print the name.
	foreach( $all_plugins as $key => $val ) {
		if ( is_plugin_active( $key ) ) {
				echo $val['Name'] . '<br/>';
		}
	}
	echo '</pre>';
?>