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diff --git a/dom/html/test/test_bug512367.html b/dom/html/test/test_bug512367.html
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+++ b/dom/html/test/test_bug512367.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=512367
+-->
+<head>
+  <title>Test for Bug 512367</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.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=512367">Mozilla Bug 512367</a>
+<p id="display">
+  <iframe src="bug369370-popup.png" id="i" style="width:200px; height:200px"></iframe>
+</p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+var frame = document.getElementById("i");
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(function() {
+  var viewer =
+    SpecialPowers.wrap(frame.contentWindow)
+                 .QueryInterface(SpecialPowers.Ci.nsIInterfaceRequestor)
+                 .getInterface(SpecialPowers.Ci.nsIWebNavigation)
+                 .QueryInterface(SpecialPowers.Ci.nsIDocShell)
+                 .contentViewer;
+
+  viewer.fullZoom = 1.5;
+
+  setTimeout(function() {
+    synthesizeMouse(frame, 30, 30, {});
+
+    is(viewer.fullZoom, 1.5, "Zoom in the image frame should not have been reset");
+
+    SimpleTest.finish();
+  }, 0);
+});
+</script>
+</pre>
+</body>
+</html>