xD

// ==UserScript==
// @name F*ck you, redirecters
// @version 0.6
// @author Pavel Lymarev <x hyphen user at bk dot ru>
// @exlude /^.*:\/\/.*$/
// @include /^https?:\/\/vk\.com(?:\/.*)?$/
// @include /^https?:\/\/(?:[a-z]+\.)?google\.(?:com|ru)(?:\/.*)?$/
// @include /^https?:\/\/(?:[a-z]+\.)?youtube\.com(?:\/.*)?$/
// @run-at document-start
// @grant none
// ==/UserScript==

const youtubeRe = /https?:\/\/(?:[a-z]+\.)?youtube\.com\/redirect\?(?:.+)$/i;
const vkRe      = /https?:\/\/vk\.com\/away\.php\?(?:.+)$/i;
const googleRe  = /https?:\/\/(?:[a-z]+\.)?google\.(?:com|ru)\/url\?(?:.+)$/i;

function processNode(node) {
    if (node.href == null) {
        return;
    }

    if (youtubeRe.test(node.href)) {
        node.href = new URL(node.href).searchParams.get('q');
    } else if (vkRe.test(node.href)) {
        node.href = new URL(node.href).searchParams.get('to');
    } else if (googleRe.test(node.href)) {
        node.href = new URL(node.href).searchParams.get('url');
    }
}

new MutationObserver(function(mutations) {
    mutations.forEach(function(mutation) {
        if (mutation.type === 'attributes') {
            var node = mutation.target;
            if (node.tagName === 'A' && mutation.attributeName === 'href') {
                processNode(node);
            }
        } else if (mutation.type === 'childList') {
            Array.prototype.forEach.call(mutation.addedNodes, function(node) {
                if (node.tagName === 'A') {
                    processNode(node);
                }
            });
        }
    });
}).observe(document, { attributes: true, childList: true, subtree: true });