diff -r 000000000000 -r 6474c204b198 browser/devtools/inspector/test/browser_inspector_scrolling.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/inspector/test/browser_inspector_scrolling.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,77 @@
+/* -*- Mode: Javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+let doc;
+let div;
+let iframe;
+let inspector;
+
+function createDocument()
+{
+  doc.title = "Inspector scrolling Tests";
+
+  iframe = doc.createElement("iframe");
+
+  iframe.addEventListener("load", function () {
+    iframe.removeEventListener("load", arguments.callee, false);
+
+    div = iframe.contentDocument.createElement("div");
+    div.textContent = "big div";
+    div.setAttribute("style", "height:500px; width:500px; border:1px solid gray;");
+    iframe.contentDocument.body.appendChild(div);
+    openInspector(inspectNode);
+  }, false);
+
+  iframe.src = "data:text/html,foo bar";
+  doc.body.appendChild(iframe);
+}
+
+function inspectNode(aInspector)
+{
+  inspector = aInspector;
+
+  let highlighter = inspector.toolbox.highlighter;
+  highlighter.showBoxModel(getNodeFront(div)).then(performScrollingTest);
+}
+
+function performScrollingTest()
+{
+  gBrowser.selectedBrowser.addEventListener("scroll", function() {
+    gBrowser.selectedBrowser.removeEventListener("scroll", arguments.callee,
+      false);
+    let isRetina = devicePixelRatio === 2;
+    is(iframe.contentDocument.body.scrollTop,
+      isRetina ? 25 : 50, "inspected iframe scrolled");
+
+    finishUp();
+  }, false);
+
+  EventUtils.synthesizeWheel(div, 10, 10,
+    { deltaY: 50.0, deltaMode: WheelEvent.DOM_DELTA_PIXEL },
+    iframe.contentWindow);
+}
+
+function finishUp()
+{
+  inspector = div = iframe = doc = null;
+  let target = TargetFactory.forTab(gBrowser.selectedTab);
+  gDevTools.closeToolbox(target);
+  gBrowser.removeCurrentTab();
+  finish();
+}
+
+function test()
+{
+  waitForExplicitFinish();
+  gBrowser.selectedTab = gBrowser.addTab();
+  gBrowser.selectedBrowser.addEventListener("load", function() {
+    gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true);
+    doc = content.document;
+    waitForFocus(createDocument, content);
+  }, true);
+
+  content.location = "data:text/html,mouse scrolling test for inspector";
+}