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+++ b/layout/forms/test/test_bug346043.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=346043
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 346043</title>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <script type="application/javascript">
+    /** Test for Bug 346043 **/
+    function test(select, index, useEscape) {
+      select.selectedIndex = index;
+      is(select.selectedIndex, index, "Selected index is broken");
+
+      // Open the select dropdown.
+      //
+      // Using Alt+Down (instead of a click) seems necessary to make subsequent
+      // mouse events work with the dropdown itself, instead of the window below
+      // it.
+      select.focus();
+      synthesizeKey("VK_DOWN", {altKey: true});
+
+      var options = select.getElementsByTagName("option");
+      synthesizeMouseAtCenter(options[1],
+                              {type: "mousemove", clickCount: 0});
+
+      // Close the select dropdown.
+      if (useEscape)
+        synthesizeKey("VK_ESCAPE", {});  // Tests a different code path.
+      select.blur();
+      is(select.selectedIndex, index, "Selected index shouldn't change");
+    }
+
+    SimpleTest.waitForExplicitFinish();
+    SimpleTest.waitForFocus(function() {
+      test(document.getElementById("test-unselected"), -1, true);
+      test(document.getElementById("test-unselected"), -1, false);
+      test(document.getElementById("test-disabled"), 0, true);
+      test(document.getElementById("test-disabled"), 0, false);
+      SimpleTest.finish();
+    });
+  </script>
+</head>
+<body>
+  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=346043">Mozilla Bug 346043</a>
+  <p id="display"></p>
+  <div id="content">
+    <select id="test-unselected">
+      <option>A</option>
+      <option>B</option>
+      <option>C</option>
+    </select>
+
+    <select id="test-disabled">
+      <option disabled>A</option>
+      <option>B</option>
+      <option>C</option>
+    </select>
+  </div>
+  <pre id="test"></pre>
+</body>
+</html>