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diff --git a/dom/tests/mochitest/bugs/test_bug641552.html b/dom/tests/mochitest/bugs/test_bug641552.html
new file mode 100644
index 000000000..ab76c74a3
--- /dev/null
+++ b/dom/tests/mochitest/bugs/test_bug641552.html
@@ -0,0 +1,88 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=641552
+-->
+<head>
+  <title>Test for Bug 641552</title>
+  <script type="application/javascript" src="/MochiKit/packed.js"></script>
+  <script type="application/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=641552">Mozilla Bug 641552</a>
+<p id="display"></p>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 641552 **/
+
+SimpleTest.waitForExplicitFinish();
+
+var contractId = "@mozilla.org/xmlextras/xmlhttprequest;1";
+var categoryEntries = [
+  {category: "JavaScript-global-property", entry: "randomname", contractId: contractId},
+];
+
+function addCategoryEntries(func) {
+  for (var categoryEntry of categoryEntries) {
+    SpecialPowers.addCategoryEntry(categoryEntry.category, categoryEntry.entry, categoryEntry.contractId,
+                                   false, true);
+  }
+  SimpleTest.executeSoon(func);
+}
+
+function removeCategoryEntries(func) {
+  for (var categoryEntry of categoryEntries) {
+    SpecialPowers.deleteCategoryEntry(categoryEntry.category, categoryEntry.entry, false);
+  }
+  SimpleTest.executeSoon(func);
+}
+
+function checkNamesPresent() {
+  ok(window.randomname, "window.randomname should return an object");
+}
+
+function checkNamesAbsent() {
+  ok(!window.randomname, "window.randomname should return undefined");
+}
+
+// Ensure the initial state
+checkNamesAbsent();
+
+addCategoryEntries(function test1() {
+  ok(window.randomname, "window.randomname should return an object");
+
+  delete window.randomname;
+
+  // The delete opertor should have no effect as long as the category entry is registered.
+  checkNamesPresent();
+
+  removeCategoryEntries(test2);
+});
+
+function test2() {
+  // The object should be cached on the global/navigator object once accessed.
+  checkNamesPresent();
+
+  delete window.randomname;
+
+  // Now the delete opertor should have the effect.
+  checkNamesAbsent();
+
+  addCategoryEntries(function() {
+    removeCategoryEntries(test3);
+  });
+}
+
+function test3() {
+  // The object should not be cached until the first access.
+  checkNamesAbsent();
+
+  SimpleTest.finish();
+}
+
+</script>
+</pre>
+</body>
+</html>