 +this.NetworkHandler = NetworkHandler;
 diff --git a/testing/juggler/protocol/PageHandler.js b/testing/juggler/protocol/PageHandler.js
 new file mode 100644
-index 0000000000000000000000000000000000000000..bf59b2afa8692d02fd0ce664eec2e9827a8209d2
+index 0000000000000000000000000000000000000000..23a32be2200e90e2e05d31aec85874a829cb1bbe
 --- /dev/null
 +++ b/testing/juggler/protocol/PageHandler.js
-@@ -0,0 +1,281 @@
+@@ -0,0 +1,285 @@
 +"use strict";
 +
 +const {Helper} = ChromeUtils.import('chrome://juggler/content/Helper.js');

+var EXPORTED_SYMBOLS = ['ScrollbarManager'];
+this.ScrollbarManager = ScrollbarManager;
+
diff --git a/testing/juggler/content/floating-scrollbars.css b/testing/juggler/content/floating-scrollbars.css
new file mode 100644
index 0000000000000000000000000000000000000000..7709bdd34c65062fc63684ef17fc792d3991d965

+    'setInterceptFileChooserDialog': {
+      params: {
+        enabled: t.Boolean,
+      },
+    },
+    'sendMessageToWorker': {
+      params: {
+        frameId: t.String,
+        workerId: t.String,
+        message: t.String,
+      },
+    },
+  },
