init

composer.json

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+{
+    "name": "saiyan/unread_favicon",
+    "type": "roundcube-plugin",
+    "license": "MIT",
+    "repositories": [
+        {
+            "type": "composer",
+            "url": "https://plugins.roundcube.net"
+        }
+    ],
+    "require": {
+        "roundcube/plugin-installer": ">=0.1.3"
+    }
+}

unread_favicon.js

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+
+function updateFavicon(){
+    var count = 0;
+    $('.unreadcount').each(function(){
+        var c = parseInt($(this).text());
+        if(c && !isNaN(c)){
+            count += c;
+        }
+    });
+    if(count !== last)
+        favicon.badge(count);
+}
+
+/*****************************/
+
+var last = -1;
+var favicon=new Favico({
+    animation:'pop'
+});
+
+window.setInterval(updateFavicon, 10000);
+

unread_favicon.php

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+<?php
+    /**
+     * Unread Favivon
+     *
+     * Shows the number of unread Emails inside the favicon
+     *
+     * @version 1.0
+     * @author Christian Sucker
+     * @url http://roundcube.net/plugins/unread_favicon
+     */
+    class unread_favicon extends rcube_plugin
+    {
+      public $task = 'mail';
+      private $map;
+
+      function init()
+      {
+           $this->include_script('favico-0.3.10.min.js');
+           $this->include_script('unread_favicon.js');
+      }
+
+    }