diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1302,21 +1302,25 @@
     $config = config('system.theme.global');
     // Provide defaults as function is used before config installed.
     $default_config = array(
-      'favicon'  => array('use_default' => 1),
-      'features' => array(
-        'comment_user_picture' => 1,
-        'comment_user_verification' => 1,
-        'favicon' => 1,
-        'logo' => 1,
-        'name' => 1,
-        'node_user_picture' => 1,
-        'main_menu' => 1,
-        'secondary_menu' => 1,
-        'slogan' => 1,
+      'favicon'  => array(
+        'path' => '',
+        // Use the IANA-registered MIME type for ICO files as default.
+        'mimetype' => 'image/vnd.microsoft.icon',
+        'use_default' => 1,
+      ),
+      'features' => array(),
+      'logo'     => array(
+        'path' => '',
+        'use_default' => 1,
       ),
-      'logo'     => array('use_default' => 1),
     );
+    // Turn on all default features.
+    $features = _system_default_theme_features();
+    foreach ($features as $feature) {
+      $default_config['features'][$feature] = 1;
+    }
     $default_config = NestedArray::mergeDeep($default_config, $config->get());
+
     // Cache a config object that will merge $default_config,
     // system.theme configuration and the theme's config.
     $cache[$theme] = clone $config;