Tampermonkey script that brings back an old Stack Exchange feature which never made it out of beta:

// ==UserScript==
// @name         Sticky post vote buttons
// @namespace    http://tampermonkey.net/
// @version      1
// @description  Sticky post vote buttons
// @author       RANDOM HOMO SAPIEN
// @match       *://*.askubuntu.com/*
// @match       *://*.mathoverflow.net/*
// @match       *://*.serverfault.com/*
// @match       *://*.stackapps.com/*
// @match       *://*.stackexchange.com/*
// @match       *://*.stackoverflow.com/*
// @match       *://*.superuser.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    $('.votecell .vote').css({'position': 'sticky', 'top': '60px'});
})();