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Disable prettify.css Preload

Use the following snippet of code in your utility plugin to disable preloading the prettify.css file:

add_action( 
    'wp_enqueue_scripts', 
    function() {
        remove_action( 'wp_head', 'prettify_preload_code_styles' );
    }, 
    15 // After the default priority 10 of the prettify plugin.
);