diff --git a/dom/tests/mochitest/localstorage/test_localStorageBasePrivateBrowsing_perwindowpb.html b/dom/tests/mochitest/localstorage/test_localStorageBasePrivateBrowsing_perwindowpb.html
index 0c7488f1b87..450de8cd8ec 100644
--- a/dom/tests/mochitest/localstorage/test_localStorageBasePrivateBrowsing_perwindowpb.html
+++ b/dom/tests/mochitest/localstorage/test_localStorageBasePrivateBrowsing_perwindowpb.html
@@ -16,7 +16,6 @@ prefBranch.setIntPref("browser.startup.page", 0);
 prefBranch.setCharPref("browser.startup.homepage_override.mstone", "ignore");
 
 function startTest() {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
   mainWindow = window.QueryInterface(Ci.nsIInterfaceRequestor)
                       .getInterface(Ci.nsIWebNavigation)
                       .QueryInterface(Ci.nsIDocShellTreeItem)
diff --git a/dom/tests/mochitest/localstorage/test_localStorageQuotaPrivateBrowsing_perwindowpb.html b/dom/tests/mochitest/localstorage/test_localStorageQuotaPrivateBrowsing_perwindowpb.html
index 7a446aa5b5b..6bce048408a 100644
--- a/dom/tests/mochitest/localstorage/test_localStorageQuotaPrivateBrowsing_perwindowpb.html
+++ b/dom/tests/mochitest/localstorage/test_localStorageQuotaPrivateBrowsing_perwindowpb.html
@@ -8,8 +8,6 @@
 <script type="text/javascript">
 SimpleTest.waitForExplicitFinish();
 
-netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
 Components.utils.import("resource://gre/modules/Services.jsm");
 
 const Ci = Components.interfaces;
@@ -50,8 +48,6 @@ function startTest() {
 }
 
 function doNextTest(aWindow) {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
   info("Running test: " + currentTest);
   switch (currentTest) {
     // Initialy setup the quota to testing value of 1024B and