/**
  * Returns the unique browser.
  *
  * @return WebDriver\Browser
  */
 public function getBrowser($create = false)
 {
     if ($create) {
         $browser = Browser::create($this->getBrowserName(), $this->getServerUrl());
         $browser->closeOnDestruct();
         return $browser;
     }
     if (null === self::$browser) {
         self::$browser = Browser::create($this->getBrowserName(), $this->getServerUrl());
         self::$browser->closeOnDestruct();
     }
     return self::$browser;
 }