DuckDuckGoogle

duckduckgoogle.user.js

// ==UserScript==
// @name            DuckDuckGoogle
// @description     Add Google search button to DuckDuckGo search form
// @namespace       github.com/gekola
// @version         0.1.2
// @author          Nick H
// @license         WTFPL
// @released        2016-03-12
// @updated         2017-04-16
// @match           *://duckduckgo.com/*
// @match           *://www.duckduckgo.com/*
// @grant           none
// @run-at          document-start
// ==/UserScript==
(function () {
  'use strict';

  document.addEventListener('DOMContentLoaded', function () {
    var form = document.getElementsByClassName('header__search')[0];
    if ((form === null) || (document.getElementById('google_search') !== null)) {
      return;
    }

    var style = document.createElement('STYLE');
    //style.innerHTML = '.search_form { right: 14px !important; }'
    document.head.appendChild(style);

    var gsearchBtn = document.createElement('BUTTON');
    gsearchBtn.innerHTML = 'G';
    gsearchBtn.id = 'google_search';
    var GBUTTON_STYLE = {
      backgroundColor: '#4787ed',
      border: '1px solid #3079ed',
      borderRadius: '2px',
      color: '#ffffff',
      cursor: 'pointer',
      height: 'auto',
      fontSize: '18px',
      fontWeight: 'bold',
      lineHeight: 1.5,
      margin: '3px 0 0 5px',
      float: 'left',
      position: 'absolute',
      right: '-36px',
      top: 0,
      width: 'auto'
    };
    for (var attr in GBUTTON_STYLE) {
      gsearchBtn.style[attr] = GBUTTON_STYLE[attr];
    }
    gsearchBtn.addEventListener('click', function(e) {
      e.preventDefault();
      var q = document.getElementById('search_form_input').value;
      document.location = '//google.com/search?q=' + encodeURI(q);
    });
    form.appendChild(gsearchBtn);
  });
})();