diff --git a/ChromePhp.php b/ChromePhp.php
index 577b1ce..5e0fc7d 100755
--- a/ChromePhp.php
+++ b/ChromePhp.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * Copyright 2010-2013 Craig Campbell
+ * Copyright 2010-2013 Craig Campbell, 2016 Erik Krause
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,13 +20,14 @@
  *
  * @package ChromePhp
  * @author Craig Campbell <iamcraigcampbell@gmail.com>
+ * @author Erik Krause <erik.krause@gmx.de>
  */
 class ChromePhp
 {
     /**
-     * @var string
+     * @var string (ek)
      */
-    const VERSION = '4.1.0';
+    const VERSION = '4.3.0';
 
     /**
      * @var string
@@ -38,6 +39,11 @@ class ChromePhp
      */
     const BACKTRACE_LEVEL = 'backtrace_level';
 
+    /**
+     * @var string (ek)
+     */
+    const LOG_STYLE = 'log_style';
+
     /**
      * @var string
      */
@@ -126,6 +132,13 @@ class ChromePhp
      */
     protected $_processed = array();
 
+    /**
+     * provide enabled / disabled state
+     *
+     * @var bool
+     */
+    protected $_enabled = true;
+
     /**
      * constructor
      */
@@ -136,6 +149,31 @@ private function __construct()
         $this->_json['request_uri'] = $_SERVER['REQUEST_URI'];
     }
 
+    /**
+     * Enable and disable logging (ek)
+     *
+     * @param boolean $Enabled TRUE to enable, FALSE to disable
+     * @param string  $style 'FirePHP' to switch to FirePHP behaviour
+     * @return void
+     */
+    public function setEnabled($Enabled, $style = '')
+    {
+       $this->_enabled = $Enabled;
+       if ($style)
+         $this->addSetting(self::LOG_STYLE, $style);
+    }
+
+    /**
+     * Check if logging is enabled
+     *
+     * @return boolean TRUE if enabled
+     */
+    public function getEnabled()
+    {
+        return $this->_enabled;
+    }
+
+
     /**
      * gets instance of this class
      *
@@ -254,10 +292,22 @@ protected static function _log($type, array $args)
             return;
         }
 
+
         $logger = self::getInstance();
 
+        // not enabled, don't do anything (ek)
+        if (!($logger->_enabled))
+            return;
+
         $logger->_processed = array();
 
+        // FirePHP passes the object name second but displays it first (ek)
+        if (($logger->getSetting(self::LOG_STYLE) == 'FirePHP') && (count($args) == 2)) {
+            $args = array_reverse($args);
+            $args[0] .= ":";
+        }
+
+
         $logs = array();
         foreach ($args as $arg) {
             $logs[] = $logger->_convert($arg);
@@ -391,7 +441,27 @@ protected function _addRow(array $logs, $backtrace, $type)
 
     protected function _writeHeader($data)
     {
-        header(self::HEADER_NAME . ': ' . $this->_encode($data));
+        $encodedData = $this->_encode($data);
+        if ($encodedData)
+          header(self::HEADER_NAME . ': ' . $encodedData);
+    }
+
+
+
+    /**
+     * recursively converts data for json_encode (ek)
+     *
+     * @param mixed ref $dat
+     */
+
+    protected static function _filterArray(&$dat)
+    {
+        if (is_resource($dat))
+            $dat = print_r($dat, true).", ".get_resource_type($dat);
+        elseif (is_numeric($dat) && !is_finite($dat))
+            $dat = print_r($dat, true) . ", numeric"; // fixes issue #35
+        elseif (!is_object($dat) && !is_null($dat) && !is_scalar($dat))
+            $dat = print_r($dat, true);
     }
 
     /**
@@ -400,8 +470,12 @@ protected function _writeHeader($data)
      * @param array $data
      * @return string
      */
+
     protected function _encode($data)
     {
+
+        array_walk_recursive($data, 'self::_filterArray'); //(ek)
+
         return base64_encode(utf8_encode(json_encode($data)));
     }
 
@@ -444,3 +518,4 @@ public function getSetting($key)
         return $this->_settings[$key];
     }
 }
+
diff --git a/README.md b/README.md
index 3dd7dbe..c8d9200 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,11 @@
 ## Overview
-ChromePhp is a PHP library for the Chrome Logger Google Chrome extension.
-
-This library allows you to log variables to the Chrome console.
+ChromePhp is a PHP library to log variables to the Chrome or Firefox devtools console.
+For Google Chrome the Chrome Logger extension is needed.
 
 ## Requirements
 - PHP 5 or later
 
-## Installation
+## Installation Chrome
 1. Install the Chrome extension from: https://chrome.google.com/extensions/detail/noaneddfkdjfnfdakjjmocngnfkfehhd
 2. Click the extension icon in the browser to enable it for the current tab's domain
 3. Put ChromePhp.php somewhere in your PHP include path
@@ -19,5 +18,56 @@ This library allows you to log variables to the Chrome console.
     ChromePhp::warn('something went wrong!');
     ```
 
+## Installation Firefox
+1. Put ChromePhp.php somewhere in your PHP include path
+2. Enable Server logging filter in the web console. If Server logging filter is not present (likely from FF 57 on), disable devtools.webconsole.new-frontend-enabled in about:config 
+or install the Firefox extension from https://addons.mozilla.org/en-US/firefox/addon/chromelogger/ to log to the new console
+3. Initialize ChromePhp for FirePHP compatibility
+
+    ```php
+    include 'ChromePhp.php';
+    $firephp = ChromePhp::getInstance();
+    $firephp->setEnabled(true, 'FirePHP');
+    ```
+    The second parameter 'FirePHP' is optional and can be omitted in subsequent calls to setEnabled. FirePHP compatibility mode can be changed by calling
+    ```php
+    // disable FirePHP mode
+    $firephp->addSetting('log_style', '');
+    
+    //enable FirePHP mode
+    $firephp->addSetting('log_style', 'FirePHP');
+    ```
+
+4. Log some data
+
+    ```php
+    $firephp->log($_GET, 'GET variables');
+    $firephp->warn('Value out of range');
+    ```
+
 More information can be found here:
+
 http://www.chromelogger.com
+
+https://developer.mozilla.org/en-US/docs/Tools/Web_Console/Console_messages#Server
+
+## Use this repository with composer
+
+To use this repository, change your composer.json to add `ccampbell/chromephp`
+in require-dev and add this in your repository list. For example:
+
+```
+"require-dev": {
+    "ccampbell/chromephp" : "dev-master"
+},
+
+"repositories": [
+    {
+        "type" : "vcs",
+        "url"  : "git@github.com:ErikKrause/chromephp.git"
+    }
+]
+
+```
+
+