Amazon to Z-Lib

// ==UserScript==
// @name         Amazon to Z-library
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Add link to libgen on all ebook products
// @author       Nobody
// @match        https://www.amazon.*/*
// @match        https://www.amazon.com/*
// @match        https://www.amazon.com.br/*
// @grant        none
// ==/UserScript==


(function() {
    'use strict';

        var button = document.querySelector("#tmmSwatches > ul");
        var name = document.querySelector("h1 > span#ebooksProductTitle, h1 > span#productTitle");
        name = encodeURI(name.innerText.replace(/ *\([^)]*\) */g, ""))

        var li = document.createElement("li");
        li.setAttribute("class", "swatchElement unselected");
        li.setAttribute("style", '"width: 122px');

        var span0 = document.createElement("span");
        span0.setAttribute("class", "a-list-item");

        var span1 = document.createElement("span");
        span1.setAttribute("class", "a-button a-spacing-mini a-button-toggle format");

        var span2 = document.createElement("span");
        span2.setAttribute("class", "a-button-inner");

        var span3 = document.createElement("span");
        span3.innerHTML = "See on Z-library";

        var br = document.createElement("br");

        var span4 = document.createElement("span");
        span4.setAttribute("class", "a-color-secondary");

        var span5 = document.createElement("span");
        span5.setAttribute("class", "a-size-base a-color-secondary");

        span5.appendChild(document.createTextNode("$ 0.00"))


        li.appendChild(span0);
        span0.appendChild(span1);
        span1.appendChild(span2);
        span3.appendChild(br)
        span3.appendChild(span4)
        span4.appendChild(span5)


        var a = document.createElement("a");
        a.setAttribute("href", "https://b-ok.cc/s/?q=" + name);
        a.setAttribute("class", "a-button-text");
        a.setAttribute("target", "_blank");
        a.setAttribute("role", "button");
        a.appendChild(span3);

        span2.appendChild(a);
        button.appendChild(li);
   
})();