quit stealing my damn focus.user.js

// ==UserScript==
// @name           quit stealing my damn focus
// @namespace      jonuts
// @description    take back cursor focus from idiotic websites that suck horribly
// @include        *
// ==/UserScript==

setTimeout(takeBack, 0);

function takeBack() {
  var inputs = document.getElementsByTagName("input");
  for (var i = inputs.length - 1; i >= 0; i--) 
    inputs[i].blur();
}