code: public function onOutput(Event $event)
      {
          $this->outputEvent = $event;
          $this->channelName = $this->debug->getCfg('channel');
          $this->data = $this->debug->getData();
          $event['headers'][] = array('X-Wf-Protocol-1', 'http://meta.wildfirehq.org/Protocol/JsonStream/0.2');
          $event['headers'][] = array('X-Wf-1-Plugin-1', 'http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/'.self::FIREPHP_PROTO_VER);
          $event['headers'][] = array('X-Wf-1-Structure-1', 'http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1');
          $heading = isset($_SERVER['REQUEST_METHOD'])
              ? $_SERVER['REQUEST_METHOD'].' '.$_SERVER['REQUEST_URI']
              : '$: '. \implode(' ', $_SERVER['argv']);
          $this->processLogEntryWEvent('groupCollapsed', array('PHP: '.$heading));
          $this->processAlerts();
          $this->processSummary();
          $this->processLog();
          $this->processLogEntryWEvent('groupEnd');
          $event['headers'][] = array('X-Wf-1-Index', $this->messageIndex);
          $this->data = array();
          return;
      }
docs: Output the log via FirePHP headers
  
  @param Event $event debug.output event object
  
  @return void