public static function init_editor() {
		/*
		 * Check if the logged in WordPress User can edit Posts or Pages.
		 */
		if ( ! current_user_can( 'edit_posts' ) && ! current_user_can( 'edit_pages' ) ) {
			return;
		}

		/*
		 * Check if the logged in WordPress User has the Visual Editor enabled.
		 */
		if ( get_user_option( 'rich_editing' ) !== 'true' ) {
			return;
		}

		/*
		 * Check if the shortcode ui disabled.
		 */
		if ( apply_filters( 'pum_disable_shortcode_ui', false ) || pum_get_option( 'disable_shortcode_ui' ) ) {
			return;
		}

		// Add shortcode ui button & js.
		add_filter( 'mce_buttons', array( __CLASS__, 'mce_buttons' ) );
		add_filter( 'mce_external_plugins', array( __CLASS__, 'mce_external_plugins' ) );

		// Add core site styles for form previews.
		add_editor_style( Popup_Maker::$URL . 'assets/css/pum-site.min.css' );

		// Process live previews.
		add_action( 'wp_ajax_pum_do_shortcode', array( __CLASS__, 'do_shortcode' ) );
		//add_action( 'wp_ajax_pum_do_shortcode', array( __CLASS__, 'wp_ajax_pum_do_shortcode' ) );
	}