Hello there,
With Lightbox Plus Colorbox, add that code in your functions.php to exclude the script which have a conflict with WP Deferred JavaScripts:
// Don't defer this script.
add_filter( 'do_not_defer', 'exlude_lightbox_scripts' );
function exlude_lightbox_scripts( $do_not_defer ) {
$do_not_defer[] = 'jquery-colorbox';
return $do_not_defer;
}
You can try to search every script loaded in your plugin by the way of “wp_enqueue_script()” to exclude the scripts one by one to find the one that should not be differed.
P.S: I found all of that in the readme.txt of the plugin.
