Tweak the highlight color for extensions in the extension list

chrome/browser/resources/extensions/extensions.css

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
 html.loading * {
   -webkit-transition-duration: 0 !important;
 }
 
 html:not(.focus-outline-visible)
 :enabled:focus:-webkit-any(input[type='checkbox'], input[type='radio']) {
@@ skipping 370 matching lines @@
 
 .extension-list-item:not(:hover) .trash:not(:focus) {
   opacity: 0;
 }
 
 .extension-list-item-wrapper.may-not-remove .trash {
   visibility: hidden;
 }
 
 .extension-highlight {
-  background: rgb(238, 238, 238);
-  background-position: auto;

[Devlin, 2014/10/01 00:39:59]

To the extent of my knowledge, there is no "auto" for these?

[Dan Beam, 2014/10/02 18:49:49]

probably right.  not a ton of usefulness, i'd guess, either way

-  background-repeat: auto;
+  background: rgb(250, 250, 250);
   border-radius: 3px;
   padding: 5px 0 5px 5px;
 }
 
 /* Supervised users */
 
 .page:not(.profile-is-supervised) .profile-is-supervised-banner,
 .profile-is-supervised .more-extensions-link {
   display: none;
 }
 
 .profile-is-supervised-banner .page-banner-text {
   background-image: url(chrome://theme/IDR_WARNING);
 }
 
 /* Sideload Wipeout */
 
 .sideload-wipeout-learn-more {
   text-decoration: none;
 }
 
 .sideload-wipeout-banner .page-banner-text {
   -webkit-padding-start: 8px;
   background-image: none;
 }