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+++ b/dom/xul/test/test_bug398289.html
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+<!DOCTYPE html>
+<html style="height: 100%">
+<head>
+  <title>Test for bug 398289</title>
+  <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="chrome://mochikit/content/tests/SimpleTest/WindowSnapshot.js"></script>
+  <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css" />
+</head>
+<body style="height: 100%; margin: 0; overflow: hidden;" onload="setTimeout(onBodyLoad, 0);">
+  <iframe id="test" style="border: 0; width: 100%; height: 100%" scrolling="no" src="398289-resource.xhtml"></iframe>
+
+  <script class="testbody">
+    var snap1, snap2;
+    SimpleTest.waitForExplicitFinish();
+
+    async function onBodyLoad() {
+      window.frames[0].document.getElementById("test").selectedIndex = 0;
+      window.frames[0].document.getElementById("test").selectedIndex = 1;
+
+      frames[0].scrollTo(0, 0);
+      scrollTo(0, 0);
+      snap1 = await snapshotWindow(window);
+
+      document.getElementById("test").onload = onFrameLoad;
+      window.frames[0].location.reload();
+    }
+
+    async function onFrameLoad() {
+      frames[0].scrollTo(0, 0);
+      scrollTo(0, 0);
+      snap2 = await snapshotWindow(window);
+
+      var equal, str1, str2;
+      [equal, str1, str2] = compareSnapshots(snap1, snap2, true);
+
+      ok(equal, "persistent attribute in tab box broken, expected: "+str1+" got: "+str2);
+      SimpleTest.finish();
+    }
+  </script>
+</body>
+</html>