togglevotedetails.user.js

// ==UserScript==
// @name        Revert Votes
// @namespace   everywhere
// @include     https://stackoverflow.com*
// @include     http://stackoverflow.com*
// @include     https://meta.stackoverflow.com*
// @include     http://meta.stackoverflow.com*
// @version     1
// @grant       none
// ==/UserScript==

 // So you can tell the Vote Count section is clickable - OCD ;)
var style = $('<style>').text('.vote-count-post { cursor: pointer !important }')
$('head').append(style)

$('.vote-count-post').each(function() {
  $(this).attr('data-clicks', '0')                          // Set number of clicks to 0
})

$(document).on('click', '.vote-count-post', function() {
  clicks = parseInt($(this).attr('data-clicks'))            // Get number of clicks
  clicks++                                                  // Increase by 1
  $(this).attr('data-clicks', String(clicks))               // Write new number

  // If click is 2nd click (vote counts need to be hidden)
  if (clicks == 2) {
    title = $(this).attr('title')                           // In the format "XXX up / XXX down"
    upvotes = parseInt(title.match(/^\d+/)[0])              // Number of Upvotes
    downvotes = parseInt(title.match(/\d+(?= down$)/)[0])   // Number of Downvotes
    score = upvotes - downvotes                             // Score of post
    $(this).text(score)                                     // Replace the vote counts with the score
    $(this).attr('data-clicks', '0')                        // Reset number of clicks
  }
})