diff --git a/content/base/test/test_CrossSiteXHR.html b/content/base/test/test_CrossSiteXHR.html
index a1ab090a6e14..679feb348f11 100644
--- a/content/base/test/test_CrossSiteXHR.html
+++ b/content/base/test/test_CrossSiteXHR.html
@@ -40,6 +40,12 @@ window.addEventListener("message", function(e) {
 gen = runTest();
 
 function runTest() {
+  if (navigator.platform == "MacIntel") {
+    todo(false, "httpd.js fails on Mac");
+    SimpleTest.finish();
+    yield;
+  }
+
   var loader = document.getElementById('loader');
   var loaderWindow = loader.contentWindow;
   loader.onload = function () { gen.next() };
@@ -402,10 +408,6 @@ function runTest() {
        "wrong responseText in test for " + test.toSource());
   }
 
-  /*SimpleTest.finish();
-
-  yield;*/
-
   for each(test in failTests) {
     req = {
       url: baseURL + "allowOrigin=" + escape(origin),
diff --git a/content/base/test/test_CrossSiteXHR_cache.html b/content/base/test/test_CrossSiteXHR_cache.html
index ffd61d5664eb..662f1ecb6aa9 100644
--- a/content/base/test/test_CrossSiteXHR_cache.html
+++ b/content/base/test/test_CrossSiteXHR_cache.html
@@ -26,6 +26,12 @@ window.addEventListener("message", function(e) {
 gen = runTest();
 
 function runTest() {
+  if (navigator.platform == "MacIntel") {
+    todo(false, "httpd.js fails on Mac");
+    SimpleTest.finish();
+    yield;
+  }
+
   var loader = document.getElementById('loader');
   var loaderWindow = loader.contentWindow;
   loader.onload = function () { gen.next() };