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diff --git a/dom/tests/mochitest/sessionstorage/test_sessionStorageBase.html b/dom/tests/mochitest/sessionstorage/test_sessionStorageBase.html
new file mode 100644
index 0000000000..e7538127fe
--- /dev/null
+++ b/dom/tests/mochitest/sessionstorage/test_sessionStorageBase.html
@@ -0,0 +1,180 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+<title>sessionStorage basic test</title>
+
+<script src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+
+<script type="text/javascript">
+
+var expectedEvents = [
+  "empty,null,",
+  "empty,,null",
+  "key1,null,value1",
+  "key1,value1,null",
+  "key1,null,value1",
+  "key2,null,value2",
+  "key2,value2,value2-2",
+  "key1,value1,value1-2",
+  "key2,value2-2,null",
+  "null,null,null"
+];
+
+function setup() {
+  sessionStorage.clear();
+  SimpleTest.executeSoon(startTest);
+}
+
+function startTest()
+{
+  // Initially check the sessionStorage is empty
+  is(sessionStorage.length, 0, "The storage is empty [1]");
+  is(sessionStorage.key(0), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(-1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.getItem("nonexisting"), null, "Nonexisting item is null (getItem())");
+  is(sessionStorage.nonexisting, undefined, "Nonexisting item is undefined (array access)");
+  is(sessionStorage.nonexisting, undefined, "Nonexisting item is undefined (property access)");
+  sessionStorage.removeItem("nonexisting"); // Just check there is no exception
+
+  is(typeof sessionStorage.getItem("nonexisting"), "object", "getItem('nonexisting') is object");
+  is(typeof sessionStorage.nonexisting, "undefined", "['nonexisting'] is undefined");
+  is(typeof sessionStorage.nonexisting, "undefined", "nonexisting is undefined");
+  is(typeof sessionStorage.getItem("nonexisting2"), "object", "getItem('nonexisting2') is object");
+  is(typeof sessionStorage.nonexisting2, "undefined", "['nonexisting2'] is undefined");
+  is(typeof sessionStorage.nonexisting2, "undefined", "nonexisting2 is undefined");
+
+  var sessionStorageCopy = sessionStorage;
+
+  function onStorageChanged(e) {
+    if (e.storageArea == sessionStorageCopy) {
+      ok(expectedEvents.length, "Not more then expected events encountered");
+      var receivedEvent = e.key + "," + e.oldValue + "," + e.newValue;
+      is(receivedEvent, expectedEvents.shift(), "Expected event data: " + receivedEvent);
+    }
+  }
+
+  // Listen for MozSessionStorageChanged
+  SpecialPowers.addChromeEventListener("MozSessionStorageChanged", onStorageChanged, true);
+
+  // add an empty-value key
+  sessionStorage.setItem("empty", "");
+  is(sessionStorage.getItem("empty"), "", "Empty value (getItem())");
+  is(sessionStorage.empty, "", "Empty value (array access)");
+  is(sessionStorage.empty, "", "Empty value (property access)");
+  is(typeof sessionStorage.getItem("empty"), "string", "getItem('empty') is string");
+  is(typeof sessionStorage.empty, "string", "['empty'] is string");
+  is(typeof sessionStorage.empty, "string", "empty is string");
+  sessionStorage.removeItem("empty");
+  is(sessionStorage.length, 0, "The storage has no keys");
+  is(sessionStorage.getItem("empty"), null, "empty item is null (getItem())");
+  is(sessionStorage.empty, undefined, "empty item is undefined (array access)");
+  is(sessionStorage.empty, undefined, "empty item is undefined (property access)");
+  is(typeof sessionStorage.getItem("empty"), "object", "getItem('empty') is object");
+  is(typeof sessionStorage.empty, "undefined", "['empty'] is undefined");
+  is(typeof sessionStorage.empty, "undefined", "empty is undefined");
+
+  // add one key, check it is there
+  sessionStorage.setItem("key1", "value1");
+  is(sessionStorage.length, 1, "The storage has one key-value pair");
+  is(sessionStorage.key(0), "key1");
+  is(sessionStorage.key(-1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(1), null, "key() should return null for out-of-bounds access");
+
+  // check all access method give the correct result
+  // and are of the correct type
+  is(sessionStorage.getItem("key1"), "value1", "getItem('key1') == value1");
+  is(sessionStorage.key1, "value1", "['key1'] == value1");
+  is(sessionStorage.key1, "value1", "key1 == value1");
+
+  is(typeof sessionStorage.getItem("key1"), "string", "getItem('key1') is string");
+  is(typeof sessionStorage.key1, "string", "['key1'] is string");
+  is(typeof sessionStorage.key1, "string", "key1 is string");
+
+  // remove the previously added key and check the storage is empty
+  sessionStorage.removeItem("key1");
+  is(sessionStorage.length, 0, "The storage is empty [2]");
+  is(sessionStorage.key(0), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.getItem("key1"), null, "\'key1\' removed");
+
+  is(typeof sessionStorage.getItem("key1"), "object", "getItem('key1') is object");
+  is(typeof sessionStorage.key1, "undefined", "['key1'] is undefined");
+  is(typeof sessionStorage.key1, "undefined", "key1 is undefined");
+
+  // add one key, check it is there
+  sessionStorage.setItem("key1", "value1");
+  is(sessionStorage.length, 1, "The storage has one key-value pair");
+  is(sessionStorage.key(0), "key1");
+  is(sessionStorage.getItem("key1"), "value1");
+
+  // add a second key
+  sessionStorage.setItem("key2", "value2");
+  is(sessionStorage.length, 2, "The storage has two key-value pairs");
+  is(sessionStorage.getItem("key1"), "value1");
+  is(sessionStorage.getItem("key2"), "value2");
+  var firstKey = sessionStorage.key(0);
+  var secondKey = sessionStorage.key(1);
+  ok((firstKey == 'key1' && secondKey == 'key2') ||
+     (firstKey == 'key2' && secondKey == 'key1'),
+     'key() API works.');
+
+  // change the second key
+  sessionStorage.setItem("key2", "value2-2");
+  is(sessionStorage.length, 2, "The storage has two key-value pairs");
+  is(sessionStorage.key(0), firstKey); // After key value changes the order must be preserved
+  is(sessionStorage.key(1), secondKey);
+  is(sessionStorage.key(-1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(2), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.getItem("key1"), "value1");
+  is(sessionStorage.getItem("key2"), "value2-2");
+
+  // change the first key
+  sessionStorage.setItem("key1", "value1-2");
+  is(sessionStorage.length, 2, "The storage has two key-value pairs");
+  is(sessionStorage.key(0), firstKey); // After key value changes the order must be preserved
+  is(sessionStorage.key(1), secondKey);
+  is(sessionStorage.key(-1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(2), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.getItem("key1"), "value1-2");
+  is(sessionStorage.getItem("key2"), "value2-2");
+
+  // remove the second key
+  sessionStorage.removeItem("key2");
+  is(sessionStorage.length, 1, "The storage has one key-value pair");
+  is(sessionStorage.key(0), "key1");
+  is(sessionStorage.key(-1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.getItem("key1"), "value1-2");
+
+  // Clear the storage
+  sessionStorage.clear();
+  is(sessionStorage.length, 0, "The storage is empty [3]");
+  is(sessionStorage.key(0), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(-1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.key(1), null, "key() should return null for out-of-bounds access");
+  is(sessionStorage.getItem("nonexisting"), null, "Nonexisting item is null");
+  is(sessionStorage.getItem("key1"), null, "key1 removed");
+  is(sessionStorage.getItem("key2"), null, "key2 removed");
+  sessionStorage.removeItem("nonexisting"); // Just check there is no exception
+  sessionStorage.removeItem("key1"); // Just check there is no exception
+  sessionStorage.removeItem("key2"); // Just check there is no exception
+
+  SimpleTest.executeSoon(function () {
+    SpecialPowers.removeChromeEventListener("MozSessionStorageChanged", onStorageChanged, true);
+    is(expectedEvents.length, 0, "received the correct number of events");
+
+    sessionStorage.clear();
+    SimpleTest.finish();
+  });
+}
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+
+</head>
+
+<body onload="setup();">
+
+</body>
+</html>