Google Lucky Button Fix - Greasemonkey script

Google_Lucky_Button_Fix.user.js

// ==UserScript==
// @name        Google Lucky Button Fix
// @namespace   -
// @version     2
// @description On Google search result pages that have "&btnI" in the url, automatically redirect to the first hit.
// @include     http*://www.google.*/*&btnI*
// @grant       none
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js
// ==/UserScript==
///window.onload = function() {
  var firstLink =
    $('#search')
      .find('.rc').first()
      .find('a').first()
      .attr('href');
  window.location.replace(firstLink);
///}

Tested with Firefox 49.0.1.