--- a/mobile/android/base/Tabs.java
+++ b/mobile/android/base/Tabs.java
@@ -2,16 +2,17 @@
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 package org.mozilla.gecko;
 
 import org.mozilla.gecko.db.BrowserDB;
 import org.mozilla.gecko.home.HomePager;
+import org.mozilla.gecko.ReaderModeUtils;
 import org.mozilla.gecko.sync.setup.SyncAccounts;
 import org.mozilla.gecko.util.GeckoEventListener;
 import org.mozilla.gecko.util.ThreadUtils;
 
 import org.json.JSONObject;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
@@ -584,17 +585,18 @@ public class Tabs implements GeckoEventL
 
     /**
      * Returns true if any of the tabs has the requested url.
      * 
      * @return true if the url is open currently, false otherwise.
      */
     public boolean hasUrl(String url) {
         for (Tab tab : mOrder) {
-            if (TextUtils.equals(tab.getURL(), url)) {
+            if (TextUtils.equals(tab.getURL(), url) ||
+                TextUtils.equals(ReaderModeUtils.getUrlFromAboutReader(tab.getURL()), url)) {
                 return true;
             }
         }
 
         return false;
     }
 
     /**