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diff --git a/dom/base/test/test_bug345339.html b/dom/base/test/test_bug345339.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=345339
+-->
+<head>
+  <title>Test for Bug 345339</title>
+  <script 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=345339">Mozilla Bug 345339</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+</div>
+ <iframe id="testframe"
+         src="http://mochi.test:8888/tests/dom/base/test/345339_iframe.html">
+ </iframe>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+/** Test for Bug 345339 **/
+SimpleTest.waitForExplicitFinish();
+
+const testData = "Test data\n";
+let file = new File([testData],
+                    "345339_test.file",
+                    { type: "text/plain" });
+
+function afterLoad() {
+    var iframeDoc = $("testframe").contentDocument;
+
+    /* change all the form controls */
+    iframeDoc.getElementById("select").selectedIndex = 1;
+    iframeDoc.getElementById("radio2").checked = true;
+    iframeDoc.getElementById("password").value = "123456";
+    iframeDoc.getElementById("hidden").value = "gecko";
+
+    // Toggle the one field to a password type then text type like password
+    // visibility toggles on the web do.
+    iframeDoc.getElementById("passwordToggle").type = "password";
+    iframeDoc.getElementById("passwordToggle").value = "abcdef";
+    iframeDoc.getElementById("passwordToggle").type = "";
+
+    SpecialPowers.wrap(iframeDoc).getElementById("file").mozSetFileArray([file]);
+
+    /* Reload the page */
+    $("testframe").setAttribute("onload", "afterReload()");
+    iframeDoc.location.reload();
+}
+
+addLoadEvent(afterLoad);
+
+function afterReload() {
+    var iframeDoc = $("testframe").contentDocument;
+
+    is(iframeDoc.getElementById("select").selectedIndex, 1,
+       "select element selected index preserved");
+    is(iframeDoc.getElementById("radio1").checked, false,
+       "radio button #1 value preserved");
+    is(iframeDoc.getElementById("radio2").checked, true,
+       "radio button #2 value preserved");
+    isnot(iframeDoc.getElementById("password").value, "123456",
+       "password field value forgotten");
+    is(iframeDoc.getElementById("hidden").value, "gecko",
+       "hidden field value preserved");
+    is(iframeDoc.getElementById("passwordToggle").value, "",
+       "former password field value not saved");
+
+    // The new file object isn't ===, but it's extensionally equal:
+    let newFile = iframeDoc.getElementById("file").files[0];
+    for (let prop of ["name", "lastModified", "size", "type"]) {
+        is(newFile[prop], file[prop],
+           "file field " + prop + " property preserved");
+    }
+    let reader = new FileReader();
+    reader.onloadend = function() {
+        SimpleTest.finish();
+    };
+    reader.onload = function() {
+        is(reader.result, testData,
+           "file field contents preserved")
+    };
+    reader.onerror = function() {
+        is(reader.error, null,
+           "FileReader error");
+    };
+    reader.readAsText(newFile);
+}
+</script>
+</pre>
+</body>
+</html>
+