diff --git a/content/xml/tests/load/load.html b/content/xml/tests/load/load.html
index ef2225f5aca..03d4fb8a2bc 100644
--- a/content/xml/tests/load/load.html
+++ b/content/xml/tests/load/load.html
@@ -1,16 +1,57 @@
 <html>
-<body>
-<h1>document.load() test</h1>
-<script>
+<head>
+<title>Synchronized document.load() test</title>
+<style type="text/css">
+.box {
+  display: box;
+  border: 1px solid black;
+  margin-bottom: 0.5em;
+}
+.boxheader {
+  font-weight: bold;
+  color: maroon;
+}
+pre {
+  margin-left: 2em;
+}
+</style>
+<script type="text/javascript">
 var xmlDoc = document.implementation.createDocument("", "test", null);
 
 function documentLoaded(e) {
-  alert(xmlDoc.getElementById("id1").firstChild.nodeValue);
+  var s = new XMLSerializer();
+  var str = s.serializeToString(xmlDoc);
+  document.getElementById("id1").firstChild.nodeValue = str;
+  var eventProperties;
+  for (prop in e) {
+    eventProperties += prop + " : '" + e[prop] + "'\n";
+  }
+  document.getElementById("id2").firstChild.nodeValue = 
+    "Event object: " + e + "\n" +
+    "Event properties:\n" + 
+    eventProperties;
 }
 
 xmlDoc.addEventListener("load", documentLoaded, false);
 
-xmlDoc.load("test.xml");
+function execute()
+{
+  xmlDoc.load("test.xml");
+}
+
+setTimeout(execute,0);
 </script>
+</head>
+<body>
+<h1>Synchronized document.load() test</h1>
+
+<div class="box"><span class="boxheader">XML document serialized</span>
+<pre id="id1">@@No result@@</pre>
+</div>
+<div class="box"><span class="boxheader">Event information</span>
+<pre id="id2">@@No result@@</pre>
+</div>
+
+</body>
 </body>
 </html>
diff --git a/extensions/xmlextras/tests/404post.html b/extensions/xmlextras/tests/404post.html
new file mode 100644
index 00000000000..8d60f2f5482
--- /dev/null
+++ b/extensions/xmlextras/tests/404post.html
@@ -0,0 +1,94 @@
+<html>
+<head><title>POST test</title>
+<style type="text/css">
+.box {
+  display: box;
+  border: 1px solid black;
+  margin-bottom: 0.5em;
+}
+.boxheader {
+  font-weight: bold;
+  color: maroon;
+}
+pre {
+  margin-left: 2em;
+}
+</style>
+<script type="text/javascript">
+const WSTRING_CONTRACTID = "@mozilla.org/supports-wstring;1";
+
+// You can only create the text string if you can bybass security, like in chrome
+var sendPlainTextData = false;
+
+var x;
+if (!sendPlainTextData) {
+  x = document.implementation.createDocument("", "test", null);
+  x.documentElement.appendChild(document.createElement("Foo"));
+  x.documentElement.appendChild(document.createElement("Bar"));
+  x.documentElement.firstChild.appendChild(document.createTextNode("My Stuff\nYeah"));
+}
+
+var p = new XMLHttpRequest();
+
+function myfunc(e)
+{
+  document.getElementById("id1").firstChild.nodeValue = p.responseText;
+  if (p.responseXML) {
+    var s = new XMLSerializer();
+    var d = p.responseXML;
+    var str = s.serializeToString(d);
+    document.getElementById("id2").firstChild.nodeValue = str;
+  }
+  document.getElementById("id3").firstChild.nodeValue = p.getAllResponseHeaders();
+  document.getElementById("id4").firstChild.nodeValue = p.status;
+  document.getElementById("id5").firstChild.nodeValue = p.statusText;
+  document.getElementById("id6").firstChild.nodeValue = p.readyState;
+  var eventProperties;
+  for (prop in e) {
+    eventProperties += prop + " : '" + e[prop] + "'\n";
+  }
+  document.getElementById("id7").firstChild.nodeValue = 
+    "Event object: " + e + "\n" +
+    "Event properties:\n" + eventProperties;
+}
+
+p.onload = myfunc;
+netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
+p.open("POST", "http://green/cgi-bin/this.handler.does.not.exist.xgfrsjfrsgdfr.cgi");
+
+if (!sendPlainTextData) {
+  p.send(x);
+} else {
+  var mystr = Components.classes[WSTRING_CONTRACTID].createInstance(Components.interfaces.nsISupportsWString);
+  mystr.data = "Heikki's data";
+  p.send(mystr);
+}
+</script>
+</head>
+<body>
+<h1>POST test</h1>
+
+<div class="box"><span class="boxheader">responseText</span>
+<pre id="id1">@@No result@@</pre>
+</div>
+<div class="box"><span class="boxheader">responseXML serialized</span>
+<pre id="id2">@@No result@@</pre>
+</div>
+<div class="box"><span class="boxheader">getAllResponseHeaders()</span>
+<pre id="id3">@@No result@@</pre>
+</div>
+<div class="box"><span class="boxheader">status</span>
+<pre id="id4">@@No result@@</pre>
+</div>
+<div class="box"><span class="boxheader">statusText</span>
+<pre id="id5">@@No result@@</pre>
+</div>
+<div class="box"><span class="boxheader">readyState</span>
+<pre id="id6">@@No result@@</pre>
+</div>
+<div class="box"><span class="boxheader">Event information</span>
+<pre id="id7">@@No result@@</pre>
+</div>
+
+</body>
+</html>
diff --git a/extensions/xmlextras/tests/get.html b/extensions/xmlextras/tests/get.html
index 8d167a6ad12..1c2efd84b02 100644
--- a/extensions/xmlextras/tests/get.html
+++ b/extensions/xmlextras/tests/get.html
@@ -18,17 +18,26 @@ pre {
 <script type="text/javascript">
 var p = new XMLHttpRequest();
 
-function myfunc()
+function myfunc(e)
 {
-  var s = new XMLSerializer();
-  var d = p.responseXML;
-  var str = s.serializeToString(d);
   document.getElementById("id1").firstChild.nodeValue = p.responseText;
-  document.getElementById("id2").firstChild.nodeValue = str;
+  if (p.responseXML) {
+    var s = new XMLSerializer();
+    var d = p.responseXML;
+    var str = s.serializeToString(d);
+    document.getElementById("id2").firstChild.nodeValue = str;
+  }
   document.getElementById("id3").firstChild.nodeValue = p.getAllResponseHeaders();
   document.getElementById("id4").firstChild.nodeValue = p.status;
   document.getElementById("id5").firstChild.nodeValue = p.statusText;
   document.getElementById("id6").firstChild.nodeValue = p.readyState;
+  var eventProperties;
+  for (prop in e) {
+    eventProperties += prop + " : '" + e[prop] + "'\n";
+  }
+  document.getElementById("id7").firstChild.nodeValue = 
+    "Event object: " + e + "\n" +
+    "Event properties:\n" + eventProperties;
 }
 
 p.onload = myfunc;
@@ -58,6 +67,9 @@ p.send(null);
 <div class="box"><span class="boxheader">readyState</span>
 <pre id="id6">@@No result@@</pre>
 </div>
+<div class="box"><span class="boxheader">Event information</span>
+<pre id="id7">@@No result@@</pre>
+</div>
 
 </body>
 </html>
diff --git a/extensions/xmlextras/tests/post.html b/extensions/xmlextras/tests/post.html
index fabca87bcec..972ad19de7c 100644
--- a/extensions/xmlextras/tests/post.html
+++ b/extensions/xmlextras/tests/post.html
@@ -30,22 +30,26 @@ if (!sendPlainTextData) {
 
 var p = new XMLHttpRequest();
 
-function myfunc()
+function myfunc(e)
 {
-  var s = new XMLSerializer();
-  var str;
-  if (!sendPlainTextData) {
-    var d = p.responseXML;
-    str = s.serializeToString(d);
-  } else {
-    str = p.responseText;
-  }
   document.getElementById("id1").firstChild.nodeValue = p.responseText;
-  document.getElementById("id2").firstChild.nodeValue = str;
+  if (p.responseXML) {
+    var s = new XMLSerializer();
+    var d = p.responseXML;
+    var str = s.serializeToString(d);
+    document.getElementById("id2").firstChild.nodeValue = str;
+  }
   document.getElementById("id3").firstChild.nodeValue = p.getAllResponseHeaders();
   document.getElementById("id4").firstChild.nodeValue = p.status;
   document.getElementById("id5").firstChild.nodeValue = p.statusText;
   document.getElementById("id6").firstChild.nodeValue = p.readyState;
+  var eventProperties;
+  for (prop in e) {
+    eventProperties += prop + " : '" + e[prop] + "'\n";
+  }
+  document.getElementById("id7").firstChild.nodeValue = 
+    "Event object: " + e + "\n" +
+    "Event properties:\n" + eventProperties;
 }
 
 p.onload = myfunc;
@@ -82,6 +86,9 @@ if (!sendPlainTextData) {
 <div class="box"><span class="boxheader">readyState</span>
 <pre id="id6">@@No result@@</pre>
 </div>
+<div class="box"><span class="boxheader">Event information</span>
+<pre id="id7">@@No result@@</pre>
+</div>
 
 </body>
 </html>
diff --git a/extensions/xmlextras/tests/post.xhtml b/extensions/xmlextras/tests/post.xhtml
new file mode 100644
index 00000000000..2a0c1e5f33b
--- /dev/null
+++ b/extensions/xmlextras/tests/post.xhtml
@@ -0,0 +1,48 @@
+<html xmlns="http://www.w3.org/1999/xhtml">
+<body>
+<h1>Posting test</h1>
+<script>
+<![CDATA[
+const WSTRING_CONTRACTID = "@mozilla.org/supports-wstring;1";
+
+var sendPlainTextData = false; // you can only create the text string if you can bybass security
+
+var x;
+if (!sendPlainTextData) {
+  x = document.implementation.createDocument("", "test", null);
+  x.documentElement.appendChild(document.createElement("Foo"));
+  x.documentElement.appendChild(document.createElement("Bar"));
+  x.documentElement.firstChild.appendChild(document.createTextNode("My Stuff\nYeah"));
+}
+
+var p = new XMLHttpRequest();
+
+function myfunc()
+{
+   var s = new XMLSerializer();
+   var str;
+   if (!sendPlainTextData) {
+     var d = p.responseXML;
+     str = s.serializeToString(d);
+   } else {
+     str = p.responseText;
+   }
+   alert(str);
+   alert(p.getAllResponseHeaders());
+}
+
+p.onload = myfunc;
+netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
+p.open("POST", "http://green/cgi-bin/echo_xml.cgi");
+
+if (!sendPlainTextData) {
+  p.send(x);
+} else {
+  var mystr = Components.classes[WSTRING_CONTRACTID].createInstance(Components.interfaces.nsISupportsWString);
+  mystr.data = "Heikki's data";
+  p.send(mystr);
+}
+]]>
+</script>
+</body>
+</html>
diff --git a/extensions/xmlextras/tests/syncpost.html b/extensions/xmlextras/tests/syncpost.html
index a89ecd88a69..03e32aaa7c8 100644
--- a/extensions/xmlextras/tests/syncpost.html
+++ b/extensions/xmlextras/tests/syncpost.html
@@ -28,11 +28,13 @@ function execute()
   p.open("POST", "http://green/cgi-bin/echo_xml.cgi", false);
   p.send(x);
 
-  var d = p.responseXML;
-  var s = new XMLSerializer()
-  str = s.serializeToString(d);
   document.getElementById("id1").firstChild.nodeValue = p.responseText;
-  document.getElementById("id2").firstChild.nodeValue = str;
+  if (p.responseXML) {
+    var s = new XMLSerializer();
+    var d = p.responseXML;
+    var str = s.serializeToString(d);
+    document.getElementById("id2").firstChild.nodeValue = str;
+  }
   document.getElementById("id3").firstChild.nodeValue = p.getAllResponseHeaders();
   document.getElementById("id4").firstChild.nodeValue = p.status;
   document.getElementById("id5").firstChild.nodeValue = p.statusText;
diff --git a/extensions/xmlextras/tests/xpost.html b/extensions/xmlextras/tests/xpost.html
index 8c3c24833b6..49e74dd0262 100644
--- a/extensions/xmlextras/tests/xpost.html
+++ b/extensions/xmlextras/tests/xpost.html
@@ -25,21 +25,37 @@ try {
 // In Mozilla, you can only create the text string if you can bybass security, like in chrome
 var sendPlainTextData = false;
 
+var docsize = 400; // the document has docsize*2+1 elements
 var x;
 if (!sendPlainTextData) {
   try {
     x = document.implementation.createDocument("", "test", null);
-    x.documentElement.appendChild(document.createElement("Foo"));
-    x.documentElement.appendChild(document.createElement("Bar"));
-    x.documentElement.firstChild.appendChild(document.createTextNode("My Stuff\nYeah"));
+    var i;
+    for (i = 0; i < docsize; i++) {
+      var fooElement = document.createElement("Foo");
+      fooElement.appendChild(document.createTextNode("My Stuff\nYeah"));
+      x.documentElement.appendChild(fooElement);
+      x.documentElement.appendChild(document.createElement("Bar"));
+    }
   } catch (e) {
     x = new ActiveXObject("Msxml2.DOMDocument");
-    x.loadXML("<?xml version='1.0'?>\n<test><foo>My Stuff\nYeah</foo><bar/></test>");
+    var str = "<?xml version='1.0'?>\n<test>";
+    var i;
+    for (i = 0; i < docsize; i++) {
+      str += "<Foo>My Stuff\nYeah</Foo><Bar/>";
+    }
+    str += "</test>";
+    x.loadXML(str);
   }
 }
 
+var interactiveCount = 0;
+
 function myfunc()
 {
+  if (p.readyState == 3) {
+    interactiveCount++;
+  }
   //alert("myfunc readyState=" + p.readyState);
   //if (p.readyState == 2) {
   //  alert(p.getAllResponseHeaders());
@@ -48,9 +64,9 @@ function myfunc()
   if (p.readyState != 4)
     return;
 
-  var str;
-
-  if (!sendPlainTextData) {
+  document.getElementById("id1").firstChild.nodeValue = p.responseText;
+  if (p.responseXML) {
+    var str;
     try {
       var s = new XMLSerializer();
       var d = p.responseXML;
@@ -58,15 +74,13 @@ function myfunc()
     } catch (e) {
       str = "@@TODO@@";
     }
-  } else {
-    str = p.responseText;
+    document.getElementById("id2").firstChild.nodeValue = str;
   }
-  document.getElementById("id1").firstChild.nodeValue = p.responseText;
-  document.getElementById("id2").firstChild.nodeValue = str;
   document.getElementById("id3").firstChild.nodeValue = p.getAllResponseHeaders();
   document.getElementById("id4").firstChild.nodeValue = p.status;
   document.getElementById("id5").firstChild.nodeValue = p.statusText;
   document.getElementById("id6").firstChild.nodeValue = p.readyState;
+  document.getElementById("id7").firstChild.nodeValue = interactiveCount;
 }
 
 // p.onload would also work in Mozilla
@@ -122,6 +136,9 @@ if (!sendPlainTextData) {
 <div class="box"><span class="boxheader">readyState</span>
 <pre id="id6">@@No result@@</pre>
 </div>
+<div class="box"><span class="boxheader"># of times onreadystatechanged handler called with INTERACTIVE status</span>
+<pre id="id7">@@No result@@</pre>
+</div>
 
 </body>
 </html>
