First-run page (revisited)

chrome/skin/firstRun.css

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/** This should be unnecessary in Gecko 2.0 and above. */
-*[hidden]
-{
-  display: none !important;
-}

[Wladimir Palant, 2013/05/28 13:39:01]

From where I'm standing this rule is obsolete and can be removed - all browsers
we support now have proper support for the hidden attribute. Did you find a
reason why it needs to be kept?

-
 body
 {
   font-family: Arial, Helvetica, sans-serif;
   font-size: 14px;
   line-height: 140%;
   color: #000000;
   background-color: #f8f6f2;
   background-image: url(/skin/background.png);
   margin: 0 auto;
   padding: 0;
@@ skipping 83 matching lines @@
   font-size: 22px;
   color: #cc0000;
   margin: 30px 0px 20px;
 }
 
 #features-title::after
 {
   content: ":";
 }
 
-.feature
+.feature:not([hidden])
 {
   display: block;
   list-style-type: none;
   padding-bottom: 20px;
 }
 
 .feature-image, .feature-description
 {
   display: inline-block;
   *display: inline; /* IE6 inline-block fix */
@@ skipping 323 matching lines @@
   }
 }
 
 @media (max-height: 700px)
 {
   body
   {
     font-size: 16px;
   }
 }