aaaxxx.user.js

// ==UserScript==
// @name           ตัด เลือก
// @namespace      http://aspietribe.com/
// @include        http://translate.google.com/*
// ==/UserScript==
// Inspired by this glitch <http://gist.github.com/330379>.
['old_tl','old_sl'].forEach(function(e) {
  var s = document.getElementById(e);
  s.style.cssText ='position:absolute; width:auto;';
  s.addEventListener('mousedown', function() {
    var x = arguments[0].target;
    x.style.left = - window.mozInnerScreenX;
    x.style.top = - window.mozInnerScreenY - window.pageYOffset;
  },false);
});