SE Comment Saver - Save Comments on SE

SECommentSaver.user.js

// ==UserScript==
// @name SE Comment Saver
// @description Save SE
// @version 1.0
// @include http://meta.stackoverflow.com/*
// @include http://*.stackexchange.com/*
// @include http://serverfault.com/*
// @include http://stackoverflow.com/*
// @include http://askubuntu.com/*
// @include http://stackapps.com/*
// @include http://superuser.com/*
// @include http://meta.serverfault.com/*
// @include http://meta.stackoverflow.com/*
// @include http://meta.askubuntu.com/*
// @include http://meta.stackapps.com/*
// @include http://meta.superuser.com/*
// @run-at document-end
// ==/UserScript==

var inject = function($){
  $(document).ready(function(){
    $('div.comments').each(function(){
      if(localStorage[$(this).attr('id')]){
        var el = $(this);
        setTimeout(function(){
          el.next().find('.js-add-link').click();
          el.find('textarea').val(localStorage[el.attr('id')]);
        },1000);
      }
    });
    $('input[value="Add Comment"]').on('click',function(){
      var id = $(this).parents('div.comments').attr('id');
      localStorage.removeItem(id);
    });
  });
  $(window).unload(function(){
    $('textarea[name=comment]:visible').each(function(){
      if($(this).val() != ""){
        var id = $(this).parents('div.comments').attr('id');
        localStorage[id] = $(this).val();
      }
    });
  });
};

var script = document.createElement('script');
script.type = 'text/javascript';
script.textContent = '(' + inject.toString() + ')(jQuery)';
document.body.appendChild(script);