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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1158558
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Test for Bug 1158558</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=1158558">Mozilla Bug 1158558</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  <input id="ipt"></input>
+</div>
+<pre id="test">
+</pre>
+<script type="application/javascript">
+
+/** Test for Bug 1158558 **/
+
+// Observers of cycle-collector-begin can be implemented in JS, and
+// thus can end up starting an incremental GC while we're in the middle
+// of a CC slice.
+
+SimpleTest.waitForExplicitFinish();
+
+var observer = {
+  observe: function(subject, topic, data) {
+    SpecialPowers.removeObserver(observer, "cycle-collector-begin");
+    SpecialPowers.Cu.getJSTestingFunctions().startgc(1);
+
+    ok(true, "Do something so the test harness doesn't get angry");
+
+    SimpleTest.finish();
+  }
+};
+
+SpecialPowers.addObserver(observer, "cycle-collector-begin");
+
+SpecialPowers.Cu.forceCC();
+
+</script>
+</body>
+</html>