gistfile1.txt

// ==UserScript==
// @name           Aliexpress URL Cleaner
// @run-at         document-start
// @namespace
// @description    Clean aliexpress item URL
// @match          *://*.aliexpress.com/item/*
// @match          *://*.aliexpress.com/store/product/*
// @version        1.2
// ==/UserScript==

(function() {
    'use strict';

    var p1 = document.URL.match(/^https?:\/\/(?:(?:..|www)[.])aliexpress[.]com\/(?:item|store\/product)(?=\/)/);
    var p2 = document.URL.match(/\/[0-9_]+[.]html(?=$|[?])/);
    if (p1 && p2 && p1+p2 != document.URL) history.replaceState(null, '', p1+p2);
})();