chrome://apps - don't launch apps on right click. Only left or middle.

chrome/browser/resources/ntp4/apps_page.js

 // 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.
 
 cr.define('ntp', function() {
   'use strict';
 
   var APP_LAUNCH = {
     // The histogram buckets (keep in sync with extension_constants.h).
     NTP_APPS_MAXIMIZED: 0,
@@ skipping 372 matching lines @@
       this.style.top = toCssPx(y);
     },
 
     onBlur_: function(e) {
       this.classList.remove('click-focus');
       this.appContents_.classList.remove('suppress-active');
     },
 
     /**
      * Invoked when an app is clicked.
-     * @param {Event} e The click/auxclick event.
+     * @param {MouseEvent} e The click/auxclick event.
      * @private
      */
     onClick_: function(e) {
+      if (e.button > 1) return;
+
       var url = !this.appData_.is_webstore ? '' :
           appendParam(this.appData_.url,
                       'utm_source',
                       'chrome-ntp-icon');
 
       chrome.send('launchApp',
                   [this.appId, APP_LAUNCH.NTP_APPS_MAXIMIZED, url,
                    e.button, e.altKey, e.ctrlKey, e.metaKey, e.shiftKey]);
 
       // Don't allow the click to trigger a link or anything
@@ skipping 365 matching lines @@
     chrome.send('launchApp', [appId, APP_LAUNCH.NTP_APP_RE_ENABLE]);
   }
 
   return {
     APP_LAUNCH: APP_LAUNCH,
     App: App,
     AppsPage: AppsPage,
     launchAppAfterEnable: launchAppAfterEnable,
   };
 });