diff --git a/core/modules/simpletest/src/BrowserTestBase.php b/core/modules/simpletest/src/BrowserTestBase.php
index e0ece50..2dc47bf 100644
--- a/core/modules/simpletest/src/BrowserTestBase.php
+++ b/core/modules/simpletest/src/BrowserTestBase.php
@@ -12,6 +12,7 @@
 use Behat\Mink\Exception\Exception;
 use Behat\Mink\Mink;
 use Behat\Mink\Session;
+//use Behat\Mink\Driver\DriverInterface;
 use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Cache\Cache;
 use Drupal\Core\Database\ConnectionNotDefinedException;
@@ -181,6 +182,13 @@
   protected $customTranslations;
 
   /**
+   * Default mink driver class name.
+   *
+   * @var string.
+   */
+  protected $defaultMinkDriverClassName = 'GoutteDriver';
+
+  /**
    * Mink session manager.
    *
    * @var \Behat\Mink\Mink
@@ -191,11 +199,11 @@
    * Initializes Mink sessions.
    */
   protected function initMink() {
-    $driver = new GoutteDriver();
+    $driver = new  $this->defaultMinkDriver();
     $session = new Session($driver);
     $this->mink = new Mink();
-    $this->mink->registerSession('goutte', $session);
-    $this->mink->setDefaultSessionName('goutte');
+    $this->mink->registerSession('default', $session);
+    $this->mink->setDefaultSessionName('default');
     $this->registerSessions();
     return $session;
   }
@@ -349,6 +357,16 @@ protected function tearDown() {
   }
 
   /**
+   * Sets default Mink driver class name.
+   *
+   * @param string $minkDriverClassName
+   *   Default Mink driver class name to use with Mink.
+   */
+  public function setDefaultMinkDriverClassName($minkDriverClassName) {
+    $this->defaultMinkDriverClassName = $minkDriverClassName;
+  }
+
+  /**
    * Returns Mink session.
    *
    * @param string $name
diff --git a/sites/default/default.services.yml b/sites/default/default.services.yml
old mode 100644
new mode 100755
diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
old mode 100644
new mode 100755