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diff --git a/dom/base/test/test_bug435425.html b/dom/base/test/test_bug435425.html
new file mode 100644
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+++ b/dom/base/test/test_bug435425.html
@@ -0,0 +1,432 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=435425
+-->
+<head>
+  <title>Test for Bug 435425</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.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=435425">Mozilla Bug 435425</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 435425 **/
+
+var xhr = null;
+var upload = null;
+var currentEvents = null;
+var expectedResponseText = null;
+var uploadTotal = 0;
+var currentProgress = -1;
+
+function logEvent(evt) {
+  var i = 0;
+  while ((currentEvents.length != i) &&
+         currentEvents[i].optional &&
+         ((currentEvents[i].type != evt.type) ||
+          !(evt.target instanceof currentEvents[i].target))) {
+    ++i;
+  }
+
+  if (evt.target instanceof XMLHttpRequestUpload) {
+    if (evt.type == "loadstart") {
+      uploadTotal = evt.total
+    } else {
+      if (evt.type == "progress") {
+        is(evt.lengthComputable, evt.total != 0, "event(" + evt.type +  ").lengthComputable should be " + (evt.total != 0 ? true : false) + ".");
+      }
+      if (evt.total != uploadTotal && evt.total != 0) {
+        ok(false, "event(" + evt.type +  ").total should not change during upload except to become 0 on error/abort/timeout.");
+      }
+    }
+  }
+
+  // There can be any number of repeated progress events, so special-case this.
+  if (evt.type == "progress") {
+    // Progress events can repeat, but their "loaded" value must increase.
+    if (currentProgress >= 0) {
+      ok(currentProgress < evt.loaded, "Progress should increase, got " +
+                                       evt.loaded + " after " + currentProgress);
+      currentProgress = evt.loaded;
+      return; // stay at the currentEvent, since we got progress instead of it.
+    }
+    // Starting a new progress event group.
+    currentProgress = evt.loaded;
+  } else {
+    // Reset the progress indicator on any other event type.
+    currentProgress = -1;
+  }
+
+  ok(i != currentEvents.length, "Extra or wrong event?");
+  is(evt.type, currentEvents[i].type, "Wrong event!")
+  ok(evt.target instanceof currentEvents[i].target,
+     "Wrong event target [" + evt.target + "," + evt.type + "]!");
+
+  // If we handled non-optional event, remove all optional events before the 
+  // handled event and then the non-optional event from the list.
+  if (!currentEvents[i].optional) {
+    for (;i != -1; --i) {
+      currentEvents.shift();
+    }
+  }
+}
+
+function hasPendingNonOptionalEvent(ev) {
+  var i = 0;
+  while (i < currentEvents.length) {
+    if (!currentEvents[i].optional && currentEvents[i].type == ev)
+      return true;
+    ++i;
+  }
+  return false;
+}
+
+function maybeStop(evt) {
+  logEvent(evt);
+  if (!hasPendingNonOptionalEvent("loadend"))
+    nextTest();
+}
+
+function openXHR(xhr, method, url, privileged) {
+  if (privileged)
+    SpecialPowers.wrap(xhr).open(method, url);
+  else
+    xhr.open(method, url);
+}
+
+function start(obj) {
+  xhr = new XMLHttpRequest();
+  upload = xhr.upload;
+  currentEvents = obj.expectedEvents;
+  expectedResponseText = obj.withUpload;
+  currentProgress = -1;
+  xhr.onload =
+    function(evt) {
+      if (expectedResponseText) {
+        is(evt.target.responseText, expectedResponseText, "Wrong responseText");
+      }
+      logEvent(evt);
+    }
+  xhr.onerror =
+    function(evt) {
+      logEvent(evt);
+    }
+  xhr.onabort =
+    function(evt) {
+      logEvent(evt);
+    }
+  xhr.onloadend =
+    function (evt) {
+      maybeStop(evt);
+    }
+  xhr.onloadstart =
+    function (evt) {
+      logEvent(evt);
+    }
+  xhr.onprogress =
+    function (evt) {
+      logEvent(evt);
+    }
+
+  if ("upload" in xhr) {
+    xhr.upload.onloadstart =
+      function (evt) {
+        logEvent(evt);
+      }
+    xhr.upload.onprogress =
+      function (evt) {
+        logEvent(evt);
+      }
+    xhr.upload.onload =
+      function (evt) {
+        logEvent(evt);
+      }
+    xhr.upload.onerror =
+      function (evt) {
+        logEvent(evt);
+      }
+    xhr.upload.onabort =
+      function (evt) {
+        logEvent(evt);
+      }
+    xhr.upload.onloadend =
+      function (evt) {
+        maybeStop(evt);
+      }
+  }
+
+  try {
+    var methodIsGet = (obj.method == "GET");
+    var url;
+    var privileged = false;
+    if (obj.testRedirectError) {
+      url = "bug435425_redirect.sjs";
+    } else if (obj.testNetworkError) {
+      url = "http://nosuchdomain.localhost";
+      privileged = true;
+    } else {
+      url = "bug435425.sjs";
+      if (obj.withUpload && methodIsGet) {
+        url += "?" + obj.withUpload;
+      }
+    }
+    openXHR(xhr, obj.method, url, privileged);
+    xhr.send(!methodIsGet ? obj.withUpload : null);
+    if (obj.testAbort) {
+      xhr.abort();
+    }
+  } catch (ex) {
+    ok(false, ex);
+  }
+}
+
+var none = null;
+var small = "";
+var mid = "";
+var large = "";
+
+
+for (var smallLength = 0; smallLength < (0x00000000 + 2); ++smallLength) {
+  small += "A";
+}
+
+for (var midLength = 0; midLength < (0x00000FFF + 2); ++midLength) {
+  mid += "A";
+}
+
+for (var largeLength = 0; largeLength < (0x0000FFFF + 2); ++largeLength) {
+  large += "A";
+}
+
+const XHR = XMLHttpRequest;
+const UPLOAD = XMLHttpRequestUpload;
+
+var tests = 
+  [
+    { method: "GET", withUpload: none, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: none, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: none, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: none, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+
+    { method: "GET", withUpload: small, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: small, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: small, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: small, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+
+    { method: "GET", withUpload: mid, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: mid, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: mid, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: mid, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+
+    { method: "GET", withUpload: large, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: large, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: large, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "GET", withUpload: large, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+
+    { method: "POST", withUpload: none, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: none, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: none, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: none, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+
+    { method: "POST", withUpload: small, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: false},
+                       {target: UPLOAD, type: "load", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: small, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: true},
+                       {target: UPLOAD, type: "abort", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: small, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: true},
+                       {target: UPLOAD, type: "error", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: small, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "error", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+
+    { method: "POST", withUpload: mid, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: false},
+                       {target: UPLOAD, type: "load", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: mid, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: true},
+                       {target: UPLOAD, type: "abort", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: mid, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: true},
+                       {target: UPLOAD, type: "error", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: mid, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "error", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+
+    { method: "POST", withUpload: large, testAbort: false, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: false},
+                       {target: UPLOAD, type: "load", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "progress", optional: false},
+                       {target: XHR, type: "load", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: large, testAbort: true, testRedirectError: false, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: true},
+                       {target: UPLOAD, type: "abort", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "progress", optional: true},
+                       {target: XHR, type: "abort", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: large, testAbort: false, testRedirectError: true, testNetworkError: false,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "progress", optional: true},
+                       {target: UPLOAD, type: "error", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+    { method: "POST", withUpload: large, testAbort: false, testRedirectError: false, testNetworkError: true,
+      expectedEvents: [{target: XHR, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "loadstart", optional: false},
+                       {target: UPLOAD, type: "error", optional: false},
+                       {target: UPLOAD, type: "loadend", optional: false},
+                       {target: XHR, type: "error", optional: false},
+                       {target: XHR, type: "loadend", optional: false}]},
+];
+
+function runTest() {
+  var test = tests.shift();
+  start(test);
+}
+
+function nextTest() {
+  if (tests.length) {
+    setTimeout("runTest()", 0);
+  } else {
+    SimpleTest.finish();
+  }
+}
+
+ok("upload" in (new XMLHttpRequest()), "XMLHttpRequest.upload isn't supported!");
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+
+</script>
+</pre>
+</body>
+</html>
+