// ==UserScript==
// @name	Display Hidden Form Fields
// @namespace		http://diveintomark.org/projects/greasemonkey/
// @description		un-hide hidden form fields and make them editable
// @include			*
// ==/UserScript==
var snapHidden = document.evaluate("//input[@type='hidden']",
  document, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
for (var i = snapHidden.snapshotLength - 1; i >= 0; i--) {
  var elmHidden = snapHidden.snapshotItem(i);
  elmHidden.style.MozOutline = '1px dashed #666';
  elmHidden.type = 'text';
  elmHidden.title = 'Hidden field "' +
    (elmHidden.name || elmHidden.id) + '"';
}