diff --git a/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php b/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php
index 267b012966..2636bc3b89 100644
--- a/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php
+++ b/src/Symfony/Bridge/Monolog/Handler/ChromePhpHandler.php
@@ -41,7 +41,7 @@ class ChromePhpHandler extends BaseChromePhpHandler
             return;
         }
 
-        if (!preg_match('{\bChrome/\d+[\.\d+]*\b}', $event->getRequest()->headers->get('User-Agent'))) {
+        if (!preg_match('{\b(?:Chrome/\d+(?:\.\d+)*|Firefox/(?:4[3-9]|[5-9]\d|\d{3,})(?:\.\d)*)\b}', $event->getRequest()->headers->get('User-Agent'))) {
             $this->sendHeaders = false;
             $this->headers = array();
 
diff --git a/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php b/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
index 8caacb2dc5..b7bc86320d 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php
@@ -56,7 +56,8 @@ class CollectionType extends AbstractType
         ));
 
         if ($form->getConfig()->hasAttribute('prototype')) {
-            $view->vars['prototype'] = $form->getConfig()->getAttribute('prototype')->createView($view);
+            $prototype = $form->getConfig()->getAttribute('prototype');
+            $view->vars['prototype'] = $prototype->setParent($form)->createView($view);
         }
     }
 
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php
index efe241d84d..fe4543e844 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/CollectionTypeTest.php
@@ -300,4 +300,46 @@ class CollectionTypeTest extends \Symfony\Component\Form\Test\TypeTestCase
         $this->assertFalse($form->createView()->vars['required'], 'collection is not required');
         $this->assertFalse($form->createView()->vars['prototype']->vars['required'], '"prototype" should not be required');
     }
+
+    public function testPrototypeSetNotRequiredIfParentNotRequired()
+    {
+        $child = $this->factory->create('collection', array(), array(
+            'type' => 'file',
+            'allow_add' => true,
+            'prototype' => true,
+            'prototype_name' => '__test__',
+        ));
+
+        $parent = $this->factory->create('form', array(), array(
+            'required' => false,
+        ));
+
+        $child->setParent($parent);
+        $this->assertFalse($parent->createView()->vars['required'], 'Parent is not required');
+        $this->assertFalse($child->createView()->vars['required'], 'Child is not required');
+        $this->assertFalse($child->createView()->vars['prototype']->vars['required'], '"Prototype" should not be required');
+    }
+
+    public function testPrototypeNotOverrideRequiredByEntryOptionsInFavorOfParent()
+    {
+        $child = $this->factory->create('collection', array(), array(
+            'type' => 'file',
+            'allow_add' => true,
+            'prototype' => true,
+            'prototype_name' => '__test__',
+            'options' => array(
+                'required' => true,
+            ),
+        ));
+
+        $parent = $this->factory->create('form', array(), array(
+            'required' => false,
+        ));
+
+        $child->setParent($parent);
+
+        $this->assertFalse($parent->createView()->vars['required'], 'Parent is not required');
+        $this->assertFalse($child->createView()->vars['required'], 'Child is not required');
+        $this->assertFalse($child->createView()->vars['prototype']->vars['required'], '"Prototype" should not be required');
+    }
 }
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index b5b7c91a2c..da6244ddb9 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -715,7 +715,7 @@ class Request
      * public property instead (query, attributes, request).
      *
      * @param string $key     the key
-     * @param mixed  $default the default value
+     * @param mixed  $default the default value if the parameter key does not exist
      * @param bool   $deep    is parameter deep in multidimensional array
      *
      * @return mixed
diff --git a/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php b/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
index 7c068fe49b..7de83d2513 100644
--- a/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
+++ b/src/Symfony/Component/Security/Http/Firewall/SwitchUserListener.php
@@ -12,6 +12,7 @@
 namespace Symfony\Component\Security\Http\Firewall;
 
 use Symfony\Component\Security\Core\Exception\AccessDeniedException;
+use Symfony\Component\Security\Core\User\UserInterface;
 use Symfony\Component\Security\Core\User\UserProviderInterface;
 use Symfony\Component\Security\Core\User\UserCheckerInterface;
 use Symfony\Component\Security\Core\Authorization\AccessDecisionManagerInterface;
@@ -161,7 +162,7 @@ class SwitchUserListener implements ListenerInterface
             throw new AuthenticationCredentialsNotFoundException('Could not find original Token object.');
         }
 
-        if (null !== $this->dispatcher) {
+        if (null !== $this->dispatcher && $original->getUser() instanceof UserInterface) {
             $user = $this->provider->refreshUser($original->getUser());
             $switchEvent = new SwitchUserEvent($request, $user);
             $this->dispatcher->dispatch(SecurityEvents::SWITCH_USER, $switchEvent);
diff --git a/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php b/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php
index f43b564322..bca2c4a333 100644
--- a/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php
+++ b/src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php
@@ -158,6 +158,54 @@ class SwitchUserListenerTest extends \PHPUnit_Framework_TestCase
         $listener->handle($this->event);
     }
 
+    public function testExitUserDoesNotDispatchEventWithStringUser()
+    {
+        $originalUser = 'anon.';
+        $refreshedUser = $this->getMock('Symfony\Component\Security\Core\User\UserInterface');
+        $this
+            ->userProvider
+            ->expects($this->never())
+            ->method('refreshUser');
+        $originalToken = $this->getToken();
+        $originalToken
+            ->expects($this->any())
+            ->method('getUser')
+            ->willReturn($originalUser);
+        $role = $this
+            ->getMockBuilder('Symfony\Component\Security\Core\Role\SwitchUserRole')
+            ->disableOriginalConstructor()
+            ->getMock();
+        $role
+            ->expects($this->any())
+            ->method('getSource')
+            ->willReturn($originalToken);
+        $this
+            ->tokenStorage
+            ->expects($this->any())
+            ->method('getToken')
+            ->willReturn($this->getToken(array($role)));
+        $this
+            ->request
+            ->expects($this->any())
+            ->method('all')
+            ->with('_switch_user')
+            ->willReturn('_exit');
+        $this
+            ->request
+            ->expects($this->any())
+            ->method('getUri')
+            ->willReturn('/');
+
+        $dispatcher = $this->getMock('Symfony\Component\EventDispatcher\EventDispatcherInterface');
+        $dispatcher
+            ->expects($this->never())
+            ->method('dispatch')
+        ;
+
+        $listener = new SwitchUserListener($this->tokenStorage, $this->userProvider, $this->userChecker, 'provider123', $this->accessDecisionManager, null, '_switch_user', 'ROLE_ALLOWED_TO_SWITCH', $dispatcher);
+        $listener->handle($this->event);
+    }
+
     /**
      * @expectedException \Symfony\Component\Security\Core\Exception\AccessDeniedException
      */