tampermonkey script to filter product with best discount

BestSecretHighlighter.user.js

// ==UserScript==
// @name         Best secret highlighter
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       petitchamp
// @match        https://www.bestsecret.fr/*category.htm*
// @match        https://www.bestsecret.fr/search.htm*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=bestsecret.fr
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const discountThreshold = 50;
    const orderSelect = document.querySelector('#sortBy');
    if(orderSelect)
    {

    }
     const savingList = document.querySelectorAll('.t-savings');
     savingList.forEach(saving=>{
        const discountStr = saving.textContent.slice(1,3);
         const discount = parseInt(discountStr);
         if(discount<discountThreshold)
         {
            saving.offsetParent.offsetParent.parentNode.remove();
         }

     });
    
})();