diff --git a/src/browser/index.jsx b/src/browser/index.jsx
index 56761f16..5800ced9 100644
--- a/src/browser/index.jsx
+++ b/src/browser/index.jsx
@@ -9,6 +9,10 @@ const Tab = ReactBootstrap.Tab;
 const electron = require('electron');
 const remote = electron.remote;
 
+const osLocale = require('os-locale');
+const fs = require('fs');
+const url = require('url');
+
 const settings = require('../common/settings');
 
 var MainPage = React.createClass({
@@ -57,13 +61,77 @@ var MainPage = React.createClass({
 });
 
 var MattermostView = React.createClass({
+  getInitialState: function() {
+    return {
+      unreadCount: 0
+    };
+  },
+  handleUnreadCountChange: function(count) {
+    this.setState({
+      unreadCount: count
+    });
+    if (this.props.onUnreadCountChange) {
+      this.props.onUnreadCountChange(count);
+    }
+  },
+  componentDidMount: function() {
+    var thisObj = this;
+    var webview = ReactDOM.findDOMNode(this.refs.webview);
+
+    // Open link in browserWindow. for exmaple, attached files.
+    webview.addEventListener('new-window', function(e) {
+      var currentURL = url.parse(webview.getURL());
+      var destURL = url.parse(e.url);
+      if (currentURL.host === destURL.host) {
+        window.open(e.url, 'electron-mattermost');
+      } else {
+        // if the link is external, use default browser.
+        require('shell').openExternal(e.url);
+      }
+    });
+
+    webview.addEventListener("dom-ready", function() {
+      // webview.openDevTools();
+
+      // Use 'Meiryo UI' and 'MS Gothic' to prevent CJK fonts on Windows(JP).
+      if (process.platform === 'win32') {
+        var applyCssFile = function(cssFile) {
+          fs.readFile(cssFile, 'utf8', function(err, data) {
+            if (err) {
+              console.log(err);
+              return;
+            }
+            webview.insertCSS(data);
+          });
+        };
+
+        osLocale(function(err, locale) {
+          if (err) {
+            console.log(err);
+            return;
+          }
+          if (locale === 'ja_JP') {
+            applyCssFile(__dirname + '/css/jp_fonts.css');
+          }
+        });
+      }
+    });
+
+    webview.addEventListener('ipc-message', function(event) {
+      switch (event.channel) {
+        case 'onUnreadCountChange':
+          var unreadCount = event.args[0];
+          thisObj.handleUnreadCountChange(unreadCount);
+          break;
+      }
+    });
+
+  },
   render: function() {
     // 'disablewebsecurity' is necessary to display external images.
     // However, it allows also CSS/JavaScript.
     // So webview should use 'allowDisplayingInsecureContent' as same as BrowserWindow.
-    return (
-      <webview style={ this.props.style } preload="webview/mattermost.js" src={ this.props.src } allowpopups></webview>
-      );
+    return (<webview style={ this.props.style } preload="webview/mattermost.js" src={ this.props.src } ref="webview"></webview>);
   }
 });
 
diff --git a/src/browser/webview/mattermost.js b/src/browser/webview/mattermost.js
index d8c83986..80543b3a 100644
--- a/src/browser/webview/mattermost.js
+++ b/src/browser/webview/mattermost.js
@@ -4,10 +4,16 @@ const electron = require('electron');
 const ipc = electron.ipcRenderer;
 const NativeNotification = Notification;
 
-ipc.on('retrieveUnreadCount', function() {
+var unreadCountTimer = setInterval(function() {
+  if (!this.count) {
+    this.count = 0;
+  }
   var unreadCount = document.getElementsByClassName('unread-title').length;
-  ipc.sendToHost('retrieveUnreadCount', unreadCount);
-});
+  if (this.count != unreadCount) {
+    ipc.sendToHost('onUnreadCountChange', unreadCount);
+  }
+  this.count = unreadCount;
+}, 1000);
 
 // On Windows 8.1 and Windows 8, a shortcut with a Application User Model ID must be installed to the Start screen.
 // In current version, use tray balloon for notification