// ==UserScript==
// @name     Hide deleted comments
// @grant    none
// @include  http://steamcommunity.com/*
// @require  http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js
// ==/UserScript==

$(document).ready(function() {
  $("comment_item_title.ellipsis:contains('This item was moved or deleted.')")
   .parents('commenthistory_comment').hide();
});