google.userscript.js

// ==UserScript==
// @name 去掉Google搜索跳转
// @namespace Google
// @include https://www.google.co*
// @include http://www.google.co*
// @grant GM_setValue
// @version 1
// ==/UserScript==

document.addEventListener('DOMNodeInserted', checksearch, false);
function checksearch() {
  var list = document.getElementById('ires');
  if (list) {
    document.removeEventListener('DOMNodeInserted', checksearch, false);
    document.addEventListener('DOMNodeInserted', clear, false)
  };
}

function clear() {
  var items = document.querySelectorAll('a[onmousedown]');
  for (var i = 0; i < items.length; i++) {
    items[i].removeAttribute('onmousedown');
  }
}