diff --git a/public/js/cover.js b/public/js/cover.js
index 30a8e5c84..245127d15 100644
--- a/public/js/cover.js
+++ b/public/js/cover.js
@@ -17,6 +17,7 @@ var postHistoryToServer = historyModule.postHistoryToServer;
 var deleteServerHistory = historyModule.deleteServerHistory;
 var parseServerToHistory = historyModule.parseServerToHistory;
 var saveStorageHistoryToServer = historyModule.saveStorageHistoryToServer;
+var clearDuplicatedHistory = historyModule.clearDuplicatedHistory;
 
 var saveAs = require('file-saver').saveAs;
 var List = require('list.js');
diff --git a/public/js/history.js b/public/js/history.js
index d5082dd9c..8593bbcff 100644
--- a/public/js/history.js
+++ b/public/js/history.js
@@ -10,7 +10,7 @@ var extra = require('./extra');
 var renderFilename = extra.renderFilename;
 var md = extra.md;
 
-var migrateHistoryFromTempCallback = null;
+window.migrateHistoryFromTempCallback = null;
 
 migrateHistoryFromTemp();
 
@@ -417,5 +417,6 @@ module.exports = {
     postHistoryToServer: postHistoryToServer,
     deleteServerHistory: deleteServerHistory,
     parseServerToHistory: parseServerToHistory,
-    saveStorageHistoryToServer: saveStorageHistoryToServer
+    saveStorageHistoryToServer: saveStorageHistoryToServer,
+    clearDuplicatedHistory: clearDuplicatedHistory
 }
diff --git a/public/views/index.ejs b/public/views/index.ejs
index 0bc3dd505..e28945892 100644
--- a/public/views/index.ejs
+++ b/public/views/index.ejs
@@ -204,7 +204,9 @@
     <script src="<%- url %>/vendor/velocity/velocity.min.js" defer></script>
 	<script src="<%- url %>/vendor/moment/min/moment-with-locales.min.js" defer></script>
 	<% } %>
-	<script src="//ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js" defer></script>
+	<script src="//ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
+    <script src="//cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
+	<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" defer></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.4/lodash.min.js" defer></script>
     <%- include build/cover-scripts %>
 </body>