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diff --git a/image/test/mochitest/test_net_failedtoprocess.html b/image/test/mochitest/test_net_failedtoprocess.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+Test that a image decoding error producs a net:failed-to-process-uri-content
+observer event with the nsIURI of the failed image as the subject
+-->
+<head>
+ <title>Test for image net:failed-to-process-uri-content</title>
+ <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<p id="display"></p>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+const Ci = SpecialPowers.Ci;
+const Cc = SpecialPowers.Cc;
+var obs = Cc["@mozilla.org/observer-service;1"].getService();
+obs = obs.QueryInterface(Ci.nsIObserverService);
+
+var observer = {
+ QueryInterface: function (aIID) {
+ if (aIID.equals(Ci.nsISupports) ||
+ aIID.equals(Ci.nsIObserver))
+ return this;
+ throw Cr.NS_ERROR_NO_INTERFACE;
+ },
+
+ observe: function(subject, topic, data) {
+ ok(topic == "net:failed-to-process-uri-content", "wrong topic");
+ subject = subject.QueryInterface(Ci.nsIURI);
+ is(subject.asciiSpec, "http://mochi.test:8888/tests/image/test/mochitest/invalid.jpg", "wrong subject");
+
+ obs.removeObserver(this, "net:failed-to-process-uri-content");
+
+ SimpleTest.finish();
+ }
+};
+
+obs.addObserver(SpecialPowers.wrapCallbackObject(observer), "net:failed-to-process-uri-content", false);
+
+document.write('<img src="damon.jpg">');
+document.write('<img src="invalid.jpg">');
+
+</script>
+</body>
+</html>