Userscript to noop the annoying Stack Overflow "You haven't voted on questions in a while" nag.

noop-question-voting-nag.user.js

// ==UserScript==
// @match http://stackoverflow.com/*
// ==/UserScript==

function exec(fn) {
    var script = document.createElement('script');
    script.setAttribute("type", "application/javascript");
    script.textContent = '(' + fn + ')();';
    document.body.appendChild(script);
    document.body.removeChild(script);
}

function patchQuestionVotingNag() {
  if (!StackExchange || !StackExchange.helpers || !StackExchange.helpers.showErrorPopup)
    return;

  var oldShowErrorPopup = StackExchange.helpers.showErrorPopup;

  StackExchange.helpers.showErrorPopup = function(g, h, i) {
    if (h.indexOf('you haven\'t voted on questions in a while') !== -1)
      return;
      
    // else
    oldShowErrorPopup(g, h, i);
  }
}

exec(patchQuestionVotingNag);