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diff --git a/dom/html/test/test_bug500885.html b/dom/html/test/test_bug500885.html
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+++ b/dom/html/test/test_bug500885.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=500885
+-->
+<head>
+  <title>Test for Bug 500885</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  <script type="text/javascript" src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=500885">Mozilla Bug 500885</a>
+<div>
+  <input id="file" type="file" />
+</div>
+<script type="text/javascript">
+
+var MockFilePicker = SpecialPowers.MockFilePicker;
+MockFilePicker.init(window);
+MockFilePicker.returnValue = MockFilePicker.returnOK;
+
+async function test() {
+  // SpecialPowers.DOMWindowUtils doesn't appear to fire mouseEvents correctly
+  var wu = SpecialPowers.getDOMWindowUtils(window);
+
+  try {
+    var domActivateEvents;
+    var fileInput = document.getElementById("file");
+    var rect = fileInput.getBoundingClientRect();
+
+    fileInput.addEventListener ("DOMActivate", function (e) {
+      ok("detail" in e, "DOMActivate should have .detail");
+      is(e.detail, 1, ".detail should be 1");
+      domActivateEvents++;
+    });
+
+    fileInput.scrollIntoView({ behaviour: "smooth" });
+    await promiseApzFlushedRepaints();
+
+    domActivateEvents = 0;
+    wu.sendMouseEvent("mousedown", rect.left + 5, rect.top + 5, 0, 1, 0);
+    wu.sendMouseEvent("mouseup", rect.left + 5, rect.top + 5, 0, 1, 0);
+    is(domActivateEvents, 1, "click on button should fire 1 DOMActivate event");
+
+    domActivateEvents = 0;
+    wu.sendMouseEvent("mousedown", rect.right - 5, rect.top + 5, 0, 1, 0);
+    wu.sendMouseEvent("mouseup", rect.right - 5, rect.top + 5, 0, 1, 0);
+    is(domActivateEvents, 1, "click on text field should fire 1 DOMActivate event");
+  } finally {
+    SimpleTest.executeSoon(function() {
+      MockFilePicker.cleanup();
+      SimpleTest.finish();
+    });
+  }
+}
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(test);
+
+</script>
+</body>
+
+</html>