diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug673196.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug673196.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  function onLoad(win) {
+    registerCleanupFunction(function () win.close());
+    win.gBrowser.addTab();
+  }
+
+  function onShow(win) {
+    let cw = win.TabView.getContentWindow();
+    let group = cw.GroupItems.groupItems[0];
+
+    // shrink the group to make some room for dragging
+    group.setSize(200, 200, true);
+
+    waitForFocus(function () {
+      let target = group.getChild(0).container;
+      EventUtils.synthesizeMouseAtCenter(target, {type: "mousedown"}, cw);
+      EventUtils.synthesizeMouse(target, 0, 300, {type: "mousemove"}, cw);
+      EventUtils.synthesizeMouseAtCenter(target, {type: "mouseup"}, cw);
+
+      let newGroup = cw.GroupItems.groupItems[1];
+      let groupBounds = newGroup.getBounds();
+
+      let safeWindowBounds = cw.Items.getSafeWindowBounds();
+      ok(safeWindowBounds.contains(groupBounds),
+         "new group is within safe window bounds");
+
+      finish();
+    }, cw);
+  }
+
+  waitForExplicitFinish();
+  newWindowWithTabView(onShow, onLoad);
+}