Google_Hacked_Pictures_Search.js

// ==UserScript==
// @name         Google Hacked Pic
// @namespace    http://www.google.*/
// @include      http://www.google.*/search?*tbm=isch*
// @include      https://www.google.*/search?*tbm=isch*
// @include      http://www.google.*/imgres?*imgurl=*
// @include      https://www.google.*/imgres?*imgurl=*
// @version      0.2.1
// @description  Click left mouse button on image. Use Download and Copy Link buttons. Kek.
// @author       Mist Poryvaev
// @grant        none
// ==/UserScript==

var save_buttons = [], clipboard_buttons = [];

function makeSaveButton(tr)
{
    var td = tr.firstChild.cloneNode(true);
    var a = td.firstChild;
    a.removeAttribute("class");
    a.removeAttribute("jsaction");
    a.removeAttribute("ping");
    a.removeAttribute("href");
    a.setAttribute("id", "save_button");
    a.childNodes[1].textContent = "Скачать";
    save_buttons.push(a);
    var path = a.childNodes[0].firstChild.firstChild;
    path.setAttribute("d", "M 12 19 L 4 19 L 4 21 L 20 21 L 20 19 L 12 19 L 12 19 L 20 10 L 16 10 L 16 3 L 8 3 L 8 10 L 4 10 L 12 19 L 12 19 L 12 19");
    tr.insertBefore(td, tr.firstChild);
}
function makeLinkButton(tr)
{
    var td = tr.firstChild;
    while (td)
    {
        var a = td.firstChild;
        if (a.childNodes[1] && a.childNodes[1].textContent == "Отправить")
        {
            a.childNodes[1].textContent = "Копировать ссылку";
            a.removeAttribute("jsaction");
            clipboard_buttons.push(a);
            return;
        }
        td = td.nextSibling;
    }
}

function addSaveButton()
{
    var panels = Array.prototype.slice.call(document.getElementsByClassName("irc_but_r"));
    for (var i = 0; i < panels.length; i++)
    {
        var tr = panels[i].firstChild.firstChild;

        makeSaveButton(tr);
        makeLinkButton(tr);
    }
}

function updateSaveButton()
{
    var images = Array.prototype.slice.call(document.getElementsByClassName("irc_mi"));
    for (var i = 0; i < images.length; i++)
    {
        var a = images[i].parentNode;
        if (a.tagName.toUpperCase() == "A" && a.getAttribute("class") > "irc_mil")
        {
            var src = images[i].getAttribute("src");
            if (src)
            {
                a.setAttribute("href", src);
                if (save_buttons[i])
                {
                    save_buttons[i].setAttribute("href", src);
                    save_buttons[i].setAttribute("download", src);
                }
                if (clipboard_buttons[i])
                {
                    clipboard_buttons[i].setAttribute("onclick",
                    "document.addEventListener('copy', function(e){e.clipboardData.setData('text/plain', '" + src + "'); e.preventDefault();}); document.execCommand('copy');");
                }
            }
        }
    }
}

var prev_length1 = 0;
var timerId1 = setInterval(function()
{
    var length = document.getElementsByClassName("irc_but_r").length;
    if(length == prev_length1 && prev_length1 > 0)
    {
        addSaveButton();
        clearInterval(timerId1);
    }
    prev_length1 = length;
}, 10);


var prev_length2 = 0;
var timerId2 = setInterval(function()
{
    var length = document.getElementsByClassName("irc_mi").length;
    if(length == prev_length2 && prev_length2 > 0)
    {
        updateSaveButton();
//        clearInterval(timerId2);
    }
    prev_length2 = length;
}, 10);

The script is not recognized as a userscript. Firefox 77.0b9 x64, Microsoft Windows 10.0.18363.836, Tampermonkey 4.10.6112.