/*! jsbeautifierSettingsTweaks.js v0.2.0 by ryanpcmcquen */
window.addEventListener('load', function () {
  'use strict';
  // Set any vars you want to change here:
  var jslintCheckbox = document.getElementById('jslint-happy');
  var tabSize = document.getElementById('tabsize');
  var wrapLength = document.getElementById('wrap-line-length');

  // Set your values for those vars here:
  tabSize.value = 2;
  jslintCheckbox.checked = true;
  wrapLength.value = 80;
});

/*! jsbeautifierSettingsTweaks.js v0.3.0 by ryanpcmcquen */
window.addEventListener('load', function () {
  'use strict';
  // Set any vars you want to change here:
  var jslintCheckbox = document.getElementById('jslint-happy');
  var tabSize = document.getElementById('tabsize');
  var wrapLength = document.getElementById('wrap-line-length');

  // Set your values for those vars here:
  tabSize.value = 4;
  jslintCheckbox.checked = true;
  wrapLength.value = 120;
});

Change to 4 spaces and 120 wrap.
Change to 4 spaces and 120 wrap.