diff --git a/browser/base/content/test/test_offlineNotification.html b/browser/base/content/test/test_offlineNotification.html
index d2125ca12261..5eeccff40631 100644
--- a/browser/base/content/test/test_offlineNotification.html
+++ b/browser/base/content/test/test_offlineNotification.html
@@ -26,6 +26,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=462856
 <script class="testbody" type="text/javascript">
 
 SimpleTest.waitForExplicitFinish();
+const Cc = SpecialPowers.wrap(Components).classes;
 
 var numFinished = 0;
 
@@ -34,18 +35,17 @@ window.addEventListener("message", function(event) {
 
     if (++numFinished == 3) {
       // Clean up after ourself
-      netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-      var pm = Components.classes["@mozilla.org/permissionmanager;1"].
+      var pm = Cc["@mozilla.org/permissionmanager;1"].
                getService(Components.interfaces.nsIPermissionManager);
-      var ioService = Components.classes["@mozilla.org/network/io-service;1"]
+      var ioService = Cc["@mozilla.org/network/io-service;1"]
                         .getService(Components.interfaces.nsIIOService);
       var uri1 = ioService.newURI(frames.testFrame.location, null, null);
       var uri2 = ioService.newURI(frames.testFrame3.location, null, null);
 
-      var principal1 = Components.classes["@mozilla.org/scriptsecuritymanager;1"]
+      var principal1 = Cc["@mozilla.org/scriptsecuritymanager;1"]
                         .getService(Components.interfaces.nsIScriptSecurityManager)
                         .getNoAppCodebasePrincipal(uri1);
-      var principal2 = Components.classes["@mozilla.org/scriptsecuritymanager;1"]
+      var principal2 = Cc["@mozilla.org/scriptsecuritymanager;1"]
                         .getService(Components.interfaces.nsIScriptSecurityManager)
                         .getNoAppCodebasePrincipal(uri2);
 
@@ -108,8 +108,7 @@ function loaded() {
   // Click the notification bar's "Allow" button.  This should kick
   // off updates, which will eventually lead to getting messages from
   // the children.
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-  var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"].
+  var wm = SpecialPowers.wrap(Components).classes["@mozilla.org/appshell/window-mediator;1"].
            getService(Components.interfaces.nsIWindowMediator);
   var win = wm.getMostRecentWindow("navigator:browser");
   var notificationBox = win.gBrowser.getNotificationBox();
@@ -117,7 +116,7 @@ function loaded() {
   var notification = notificationBox.getNotificationWithValue("offline-app-requested-mochi.test");
   notification.childNodes[0].click();
 
-  notification = notificationBox.getNotificationWithValue("offline-app-requested-example.com");
+  notification = SpecialPowers.wrap(notificationBox).getNotificationWithValue("offline-app-requested-example.com");
   notification.childNodes[0].click();
 }
 
diff --git a/browser/base/content/test/test_offline_gzip.html b/browser/base/content/test/test_offline_gzip.html
index 71293816da65..baa65f1cb1ed 100644
--- a/browser/base/content/test/test_offline_gzip.html
+++ b/browser/base/content/test/test_offline_gzip.html
@@ -32,15 +32,13 @@ SimpleTest.waitForExplicitFinish();
 
 function finishTest() {
   // Clean up after ourselves.
-  netscape.security.PrivilegeManager
-          .enablePrivilege("UniversalXPConnect");
-  var pm = Components.classes["@mozilla.org/permissionmanager;1"].
+  var Cc = SpecialPowers.wrap(Components).classes;
+  var pm = Cc["@mozilla.org/permissionmanager;1"].
            getService(Components.interfaces.nsIPermissionManager);
 
-  var uri = Components.classes["@mozilla.org/network/io-service;1"]
-              .getService(Components.interfaces.nsIIOService)
+  var uri = Cc["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService)
               .newURI(window.frames[0].location, null, null);
-  var principal = Components.classes["@mozilla.org/scriptsecuritymanager;1"]
+  var principal = Cc["@mozilla.org/scriptsecuritymanager;1"]
                    .getService(Components.interfaces.nsIScriptSecurityManager)
                    .getNoAppCodebasePrincipal(uri);
 
@@ -70,8 +68,6 @@ function handleMessageEvents(event) {
       // successfully reloaded), or the string "error" appears
       // in the iframe, as in the case of bug 501422.
       intervalID = setInterval(function() {
-        netscape.security.PrivilegeManager
-                .enablePrivilege("UniversalXPConnect");
         // Sometimes document.body may not exist, and trying to access
         // it will throw an exception, so handle this case.
         try {
@@ -103,8 +99,7 @@ function loaded() {
   // Click the notification bar's "Allow" button.  This should kick
   // off updates, which will eventually lead to getting messages from
   // the iframe.
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-  var wm = Components.classes["@mozilla.org/appshell/window-mediator;1"].
+  var wm = SpecialPowers.wrap(Components).classes["@mozilla.org/appshell/window-mediator;1"].
            getService(Components.interfaces.nsIWindowMediator);
   var win = wm.getMostRecentWindow("navigator:browser");
   var notificationBox = win.gBrowser.getNotificationBox();
diff --git a/browser/components/feeds/test/test_bug589543.html b/browser/components/feeds/test/test_bug589543.html
index 9551a1cf41d4..4e187dadda3a 100644
--- a/browser/components/feeds/test/test_bug589543.html
+++ b/browser/components/feeds/test/test_bug589543.html
@@ -20,8 +20,7 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=589543
 SimpleTest.waitForExplicitFinish();
 
 addLoadEvent(function() {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-  var doc = $("testFrame").contentDocument;
+  var doc = SpecialPowers.wrap($("testFrame").contentDocument);
   var daddy = doc.getElementById("feedSubscribeLine");
   var popup = doc.getAnonymousElementByAttribute(daddy, "anonid", "handlersMenuPopup");
   isnot(popup, null, "Feed preview should have a handlers popup");
diff --git a/content/base/test/test_bug380418.html b/content/base/test/test_bug380418.html
index 08a0612182c6..56b76207bd19 100644
--- a/content/base/test/test_bug380418.html
+++ b/content/base/test/test_bug380418.html
@@ -22,14 +22,13 @@
 	request.send(null);
 	
 	// Try reading headers in privileged context
-	netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-	is(request.getResponseHeader("Set-Cookie"), "test", "Reading Set-Cookie response header in privileged context");
-	is(request.getResponseHeader("Set-Cookie2"), "test2", "Reading Set-Cookie2 response header in privileged context");
-	is(request.getResponseHeader("X-Dummy"), "test", "Reading X-Dummy response header in privileged context");
+	is(SpecialPowers.wrap(request).getResponseHeader("Set-Cookie"), "test", "Reading Set-Cookie response header in privileged context");
+	is(SpecialPowers.wrap(request).getResponseHeader("Set-Cookie2"), "test2", "Reading Set-Cookie2 response header in privileged context");
+	is(SpecialPowers.wrap(request).getResponseHeader("X-Dummy"), "test", "Reading X-Dummy response header in privileged context");
 	
-	ok(/\bSet-Cookie:/i.test(request.getAllResponseHeaders()), "Looking for Set-Cookie in all response headers in privileged context");
-	ok(/\bSet-Cookie2:/i.test(request.getAllResponseHeaders()), "Looking for Set-Cookie2 in all response headers in privileged context");
-	ok(/\bX-Dummy:/i.test(request.getAllResponseHeaders()), "Looking for X-Dummy in all response headers in privileged context");
+	ok(/\bSet-Cookie:/i.test(SpecialPowers.wrap(request).getAllResponseHeaders()), "Looking for Set-Cookie in all response headers in privileged context");
+	ok(/\bSet-Cookie2:/i.test(SpecialPowers.wrap(request).getAllResponseHeaders()), "Looking for Set-Cookie2 in all response headers in privileged context");
+	ok(/\bX-Dummy:/i.test(SpecialPowers.wrap(request).getAllResponseHeaders()), "Looking for X-Dummy in all response headers in privileged context");
 	
 	// Try reading headers in unprivileged context
 	setTimeout(function() {
diff --git a/content/html/content/test/test_bug523771.html b/content/html/content/test/test_bug523771.html
index 907605cd9db2..3599e0f30b03 100644
--- a/content/html/content/test/test_bug523771.html
+++ b/content/html/content/test/test_bug523771.html
@@ -32,26 +32,25 @@ var input2Files =
 SimpleTest.waitForExplicitFinish();
 
 function setFileInputs () {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
   f = createFileWithData(input1File.name, input1File.body);
-  singleFileInput.mozSetFileNameArray([f.path], 1);
+  SpecialPowers.wrap(singleFileInput).mozSetFileNameArray([f.path], 1);
 
   var input2FileNames = [];
   for each (file in input2Files) {
     f = createFileWithData(file.name, file.body);
     input2FileNames.push(f.path);
   }
-  multiFileInput.mozSetFileNameArray(input2FileNames, input2FileNames.length);
+  SpecialPowers.wrap(multiFileInput).mozSetFileNameArray(input2FileNames, input2FileNames.length);
 }
 
 function createFileWithData(fileName, fileData) {
-  var dirSvc = Components.classes["@mozilla.org/file/directory_service;1"]
-                         .getService(Components.interfaces.nsIProperties);
+  var dirSvc = SpecialPowers.wrap(Components).classes["@mozilla.org/file/directory_service;1"]
+                            .getService(Components.interfaces.nsIProperties);
   var testFile = dirSvc.get("ProfD", Components.interfaces.nsIFile);
   testFile.append(fileName);
-  var outStream = Components.
-                  classes["@mozilla.org/network/file-output-stream;1"].
-                  createInstance(Components.interfaces.nsIFileOutputStream);
+  var outStream = SpecialPowers.wrap(Components).
+                    classes["@mozilla.org/network/file-output-stream;1"].
+                    createInstance(Components.interfaces.nsIFileOutputStream);
   outStream.init(testFile, 0x02 | 0x08 | 0x20, // write, create, truncate
                  0666, 0);
   outStream.write(fileData, fileData.length);
diff --git a/content/html/document/test/test_bug445004.html b/content/html/document/test/test_bug445004.html
index 9ea1ff457436..159fe6a42111 100644
--- a/content/html/document/test/test_bug445004.html
+++ b/content/html/document/test/test_bug445004.html
@@ -55,9 +55,7 @@ function checkURI(uri, name, type) {
 
 function checkFrame(num) {
   // Just snarf our data
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
-  var outer = window.frames[num]
+  var outer = SpecialPowers.wrap(window.frames[num]);
   name = outer.name;
 
   is(outer.document.baseURI,
diff --git a/content/html/document/test/test_bug512367.html b/content/html/document/test/test_bug512367.html
index fb8ce13a1761..eef9c68edbc7 100644
--- a/content/html/document/test/test_bug512367.html
+++ b/content/html/document/test/test_bug512367.html
@@ -24,21 +24,19 @@ var frame = document.getElementById("i");
 
 SimpleTest.waitForExplicitFinish();
 addLoadEvent(function() {
-  netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
   var viewer =
-    frame.contentWindow
-         .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-         .getInterface(Components.interfaces.nsIWebNavigation)
-         .QueryInterface(Components.interfaces.nsIDocShell)
-         .contentViewer
-         .QueryInterface(Components.interfaces.nsIMarkupDocumentViewer);
+    SpecialPowers.wrap(frame.contentWindow
+                 .QueryInterface(Components.interfaces.nsIInterfaceRequestor))
+                 .getInterface(Components.interfaces.nsIWebNavigation)
+                 .QueryInterface(Components.interfaces.nsIDocShell)
+                 .contentViewer
+                 .QueryInterface(Components.interfaces.nsIMarkupDocumentViewer);
 
   viewer.fullZoom = 1.5;
 
   setTimeout(function() {
     synthesizeMouse(frame, 30, 30, {});
 
-    netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
     is(viewer.fullZoom, 1.5, "Zoom in the image frame should not have been reset");
 
     SimpleTest.finish();
diff --git a/dom/tests/mochitest/bugs/test_bug369306.html b/dom/tests/mochitest/bugs/test_bug369306.html
index 8bb94bbd6a42..d2f423c6c654 100644
--- a/dom/tests/mochitest/bugs/test_bug369306.html
+++ b/dom/tests/mochitest/bugs/test_bug369306.html
@@ -116,9 +116,8 @@ function test5()
     SimpleTest.executeSoon(function() {
       // We have to focus back the originating window but we can't do that with
       // .focus() or .blur() anymore.
-      netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-      var fm = Components.classes["@mozilla.org/focus-manager;1"].
-                          getService(Components.interfaces.nsIFocusManager);
+      var fm = SpecialPowers.wrap(Components).classes["@mozilla.org/focus-manager;1"]
+                            .getService(Components.interfaces.nsIFocusManager);
       fm.focusedWindow = window;
     });
   }, w, true);
@@ -126,10 +125,9 @@ function test5()
 
 function finished()
 {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-  Components.classes["@mozilla.org/preferences-service;1"]
-            .getService(Components.interfaces.nsIPrefBranch)
-            .setBoolPref("dom.disable_window_flip", gOldPrefValue);
+  SpecialPowers.wrap(Components).classes["@mozilla.org/preferences-service;1"]
+               .getService(Components.interfaces.nsIPrefBranch)
+               .setBoolPref("dom.disable_window_flip", gOldPrefValue);
   SimpleTest.finish();
 }
 
@@ -137,9 +135,8 @@ SimpleTest.waitForExplicitFinish();
 
 
 // dom.disable_window_flip has to be set to true for this test.
-netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-var prefs = Components.classes["@mozilla.org/preferences-service;1"]
-                      .getService(Components.interfaces.nsIPrefBranch);
+var prefs = SpecialPowers.wrap(Components).classes["@mozilla.org/preferences-service;1"]
+                         .getService(Components.interfaces.nsIPrefBranch);
 gOldPrefValue = prefs.getBoolPref("dom.disable_window_flip");
 prefs.setBoolPref("dom.disable_window_flip", true);
 
diff --git a/dom/tests/mochitest/whatwg/test_bug500328.html b/dom/tests/mochitest/whatwg/test_bug500328.html
index df4bad022dd6..ef6592dacef7 100644
--- a/dom/tests/mochitest/whatwg/test_bug500328.html
+++ b/dom/tests/mochitest/whatwg/test_bug500328.html
@@ -153,8 +153,7 @@ function popstateExpected(msg) {
 }
 
 function getColor(elem) {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-  var utils = document.defaultView.
+  var utils = SpecialPowers.wrap(document).defaultView.
                 QueryInterface(Components.interfaces.nsIInterfaceRequestor).
                 getInterface(Components.interfaces.nsIDOMWindowUtils);
   return utils.getVisitedDependentComputedStyle(elem, "", "color");
@@ -162,12 +161,10 @@ function getColor(elem) {
 
 function getSHistory(theWindow)
 {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
   const Ci = Components.interfaces;
-  var sh = theWindow.QueryInterface(Ci.nsIInterfaceRequestor)
-                    .getInterface(Ci.nsIWebNavigation)
-                    .sessionHistory;
+  var sh = SpecialPowers.wrap(theWindow.QueryInterface(Ci.nsIInterfaceRequestor))
+                        .getInterface(Ci.nsIWebNavigation)
+                        .sessionHistory;
   if (!sh || sh == null)
     throw("Couldn't get shistory for window!");
 
@@ -176,8 +173,6 @@ function getSHistory(theWindow)
 
 function getSHTitle(sh, offset)
 {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
   if (!offset)
     offset = 0;
 
diff --git a/editor/composer/test/test_bug519928.html b/editor/composer/test/test_bug519928.html
index d5c16f80804f..5035b17ec893 100644
--- a/editor/composer/test/test_bug519928.html
+++ b/editor/composer/test/test_bug519928.html
@@ -22,11 +22,10 @@ var iframe = document.getElementById("load-frame");
 function enableJS() allowJS(true, iframe);
 function disableJS() allowJS(false, iframe);
 function allowJS(allow, frame) {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-  frame.contentWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-                     .getInterface(Components.interfaces.nsIWebNavigation)
-                     .QueryInterface(Components.interfaces.nsIDocShell)
-                     .allowJavascript = allow;
+  SpecialPowers.wrap(frame.contentWindow.QueryInterface(Components.interfaces.nsIInterfaceRequestor))
+               .getInterface(Components.interfaces.nsIWebNavigation)
+               .QueryInterface(Components.interfaces.nsIDocShell)
+               .allowJavascript = allow;
 }
 function expectJSAllowed(allowed, testCondition, callback) {
   window.ICanRunMyJS = false;
diff --git a/editor/libeditor/html/tests/test_bug432225.html b/editor/libeditor/html/tests/test_bug432225.html
index afda7fbd61fd..7e508c2da324 100644
--- a/editor/libeditor/html/tests/test_bug432225.html
+++ b/editor/libeditor/html/tests/test_bug432225.html
@@ -36,10 +36,10 @@ function editDoc() {
 function getSpellCheckSelection() {
   var Ci = Components.interfaces;
   var win = editDoc().defaultView;
-  var editingSession = win.QueryInterface(Ci.nsIInterfaceRequestor)
-                          .getInterface(Ci.nsIWebNavigation)
-                          .QueryInterface(Ci.nsIInterfaceRequestor)
-                          .getInterface(Ci.nsIEditingSession);
+  var editingSession = SpecialPowers.wrap(win.QueryInterface(Ci.nsIInterfaceRequestor))
+                                    .getInterface(Ci.nsIWebNavigation)
+                                    .QueryInterface(Ci.nsIInterfaceRequestor)
+                                    .getInterface(Ci.nsIEditingSession);
   var editor = editingSession.getEditorForWindow(win);
   var selcon = editor.selectionController;
   return selcon.getSelection(selcon.SELECTION_SPELLCHECK);  
@@ -51,7 +51,6 @@ function runTest() {
 }  
  
 function addWords(aLimit) {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
   if (aLimit == 0) {
     is(isSpellingCheckOk(), true, "All misspellings accounted for.");
     SimpleTest.finish();
diff --git a/editor/libeditor/html/tests/test_bug468353.html b/editor/libeditor/html/tests/test_bug468353.html
index 1a5f346a0375..ac5b4bffa0e8 100644
--- a/editor/libeditor/html/tests/test_bug468353.html
+++ b/editor/libeditor/html/tests/test_bug468353.html
@@ -20,8 +20,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=468353
 var styleSheets = null;
 
 function checkStylesheets() {
-  netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-
   // Evidently RemoveStyleSheet is the only method in nsIEditorStyleSheets
   // that would throw. RemoveOverrideStyleSheet returns NS_OK even if the
   // sheet is not there
@@ -43,8 +41,6 @@ function checkStylesheets() {
 }
 
 function runTest() {
-  netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-
   const Ci = Components.interfaces;
   const Cc = Components.classes;
 
@@ -58,7 +54,7 @@ function runTest() {
   editdoc.designMode='on';
 
   // Hold the reference to the editor
-  editor = editframe.QueryInterface(Ci.nsIInterfaceRequestor)
+  editor = SpecialPowers.wrap(editframe.QueryInterface(Ci.nsIInterfaceRequestor))
                         .getInterface(Ci.nsIWebNavigation)
                         .QueryInterface(Ci.nsIInterfaceRequestor)
                         .getInterface(Ci.nsIEditingSession)
@@ -77,7 +73,7 @@ function runTest() {
   editdoc.body.contentEditable = true;
   
   // Hold the reference to the editor
-  editor = editframe.QueryInterface(Ci.nsIInterfaceRequestor)
+  editor = SpecialPowers.wrap(editframe.QueryInterface(Ci.nsIInterfaceRequestor))
                         .getInterface(Ci.nsIWebNavigation)
                         .QueryInterface(Ci.nsIInterfaceRequestor)
                         .getInterface(Ci.nsIEditingSession)
@@ -94,7 +90,7 @@ function runTest() {
   editdoc.designMode = "off";
 
   // Hold the reference to the editor
-  editor = editframe.QueryInterface(Ci.nsIInterfaceRequestor)
+  editor = SpecialPowers.wrap(editframe.QueryInterface(Ci.nsIInterfaceRequestor))
                         .getInterface(Ci.nsIWebNavigation)
                         .QueryInterface(Ci.nsIInterfaceRequestor)
                         .getInterface(Ci.nsIEditingSession)
diff --git a/editor/libeditor/html/tests/test_bug478725.html b/editor/libeditor/html/tests/test_bug478725.html
index e06c9fabedb0..8df85dfff5d3 100644
--- a/editor/libeditor/html/tests/test_bug478725.html
+++ b/editor/libeditor/html/tests/test_bug478725.html
@@ -8,8 +8,6 @@
 <script class="testbody" type="application/javascript">
 
 function runTest() {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
   function verifyContent(s) {
     var e = document.getElementById('i1');
     var doc = e.contentDocument;
@@ -27,7 +25,7 @@ function runTest() {
     selection.removeAllRanges();
     selection.selectAllChildren(e);
     selection.collapseToEnd();
-    doc.execCommand("paste", false, null);
+    SpecialPowers.wrap(doc).execCommand("paste", false, null);
    return e;
   }
 
@@ -51,7 +49,7 @@ function runTest() {
       range.selectNode(doc.getElementById(target_id));
       selection.addRange(range);
     }
-    doc.execCommand("copy", false, null);
+    SpecialPowers.wrap(doc).execCommand("copy", false, null);
     return e;
   }
 
diff --git a/editor/libeditor/html/tests/test_bug480972.html b/editor/libeditor/html/tests/test_bug480972.html
index 3865e086f30e..3eed9710040c 100644
--- a/editor/libeditor/html/tests/test_bug480972.html
+++ b/editor/libeditor/html/tests/test_bug480972.html
@@ -8,8 +8,6 @@
 <script class="testbody" type="application/javascript">
 
 function runTest() {
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
   function verifyContent(s) {
     var e = document.getElementById('i1');
     var doc = e.contentDocument;
@@ -30,7 +28,7 @@ function runTest() {
     selection.removeAllRanges();
     selection.selectAllChildren(e);
     selection.collapseToEnd();
-    doc.execCommand("paste", false, null);
+    SpecialPowers.wrap(doc).execCommand("paste", false, null);
    return e;
   }
 
@@ -54,7 +52,7 @@ function runTest() {
       range.selectNode(doc.getElementById(target_id));
       selection.addRange(range);
     }
-    doc.execCommand("copy", false, null);
+    SpecialPowers.wrap(doc).execCommand("copy", false, null);
     return e;
   }
 
diff --git a/editor/libeditor/html/tests/test_bug520189.html b/editor/libeditor/html/tests/test_bug520189.html
index 36a014e2f0d7..c57f6ab8cf39 100644
--- a/editor/libeditor/html/tests/test_bug520189.html
+++ b/editor/libeditor/html/tests/test_bug520189.html
@@ -563,13 +563,11 @@ function runTest(test) {
   } else
     elem.focus();
 
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
-  var trans = Components.classes["@mozilla.org/widget/transferable;1"]
-                        .createInstance(Components.interfaces.nsITransferable);
+  var trans = SpecialPowers.wrap(Components).classes["@mozilla.org/widget/transferable;1"]
+                           .createInstance(Components.interfaces.nsITransferable);
   trans.init(getLoadContext());
-  var data = Components.classes["@mozilla.org/supports-string;1"]
-                       .createInstance(Components.interfaces.nsISupportsString);
+  var data = SpecialPowers.wrap(Components).classes["@mozilla.org/supports-string;1"]
+                          .createInstance(Components.interfaces.nsISupportsString);
   data.data = test.payload;
   trans.addDataFlavor("text/html");
   trans.setTransferData("text/html", data, data.data.length * 2);
@@ -582,14 +580,14 @@ function runTest(test) {
       getSelection().collapse(elem, 0);
       win = window;
     }
-    editor = win.QueryInterface(Components.interfaces.nsIInterfaceRequestor)
-                .getInterface(Components.interfaces.nsIWebNavigation)
-                .QueryInterface(Components.interfaces.nsIEditorDocShell)
-                .editor;
+    editor = SpecialPowers.wrap(win).QueryInterface(Components.interfaces.nsIInterfaceRequestor)
+                          .getInterface(Components.interfaces.nsIWebNavigation)
+                          .QueryInterface(Components.interfaces.nsIEditorDocShell)
+                          .editor;
     editor.pasteTransferable(trans);
   } else {
-    var clipboard = Components.classes["@mozilla.org/widget/clipboard;1"]
-                              .getService(Components.interfaces.nsIClipboard);
+    var clipboard = SpecialPowers.wrap(Components).classes["@mozilla.org/widget/clipboard;1"]
+                                 .getService(Components.interfaces.nsIClipboard);
 
     clipboard.setData(trans, null, Components.interfaces.nsIClipboard.kGlobalClipboard);
 
diff --git a/editor/libeditor/html/tests/test_bug525389.html b/editor/libeditor/html/tests/test_bug525389.html
index 5c8b3940e27b..fbe2ef41b399 100644
--- a/editor/libeditor/html/tests/test_bug525389.html
+++ b/editor/libeditor/html/tests/test_bug525389.html
@@ -7,13 +7,14 @@
 
 <script class="testbody" type="application/javascript">
 
-  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-  var utils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor).getInterface(Components.interfaces.nsIDOMWindowUtils);
-  var Cc = Components.classes;
+  var utils = SpecialPowers.wrap(window)
+                .QueryInterface(Components.interfaces.nsIInterfaceRequestor).getInterface(Components.interfaces.nsIDOMWindowUtils);
+  var Cc = SpecialPowers.wrap(Components).classes;
   var Ci = Components.interfaces;
 
 function getLoadContext() {
-  return window.QueryInterface(Ci.nsIInterfaceRequestor)
+  return SpecialPowers.wrap(window)
+               .QueryInterface(Ci.nsIInterfaceRequestor)
                .getInterface(Ci.nsIWebNavigation)
                .QueryInterface(Ci.nsILoadContext);
 }
@@ -29,7 +30,6 @@ function runTest() {
   }
 
   function pasteInto(trans, html, target_id) {
-    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
     var e = document.getElementById('i1');
     var doc = e.contentDocument;
     doc.designMode = "on";
@@ -53,7 +53,6 @@ function runTest() {
   }
 
   function getTransferableFromClipboard(asHTML) {
-    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
     var trans = Cc["@mozilla.org/widget/transferable;1"].createInstance(Ci.nsITransferable);
     trans.init(getLoadContext());
     if (asHTML) {
@@ -67,8 +66,6 @@ function runTest() {
   }
 
   function makeTransferable(s,asHTML,target_id) {
-    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
-
     var e = document.getElementById('i2');
     var doc = e.contentDocument;
     if (asHTML) {
@@ -112,7 +109,6 @@ function runTest() {
   }
 
   function copyToClipBoard(s,asHTML,target_id) {
-    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
     var e = document.getElementById('i2');
     var doc = e.contentDocument;
     if (asHTML) {
@@ -132,7 +128,7 @@ function runTest() {
       range.selectNode(doc.getElementById(target_id));
       selection.addRange(range);
     }
-    doc.execCommand("copy", false, null);
+    SpecialPowers.wrap(doc).execCommand("copy", false, null);
     return e;
   }
 
diff --git a/editor/libeditor/html/tests/test_root_element_replacement.html b/editor/libeditor/html/tests/test_root_element_replacement.html
index d644061597d8..c0884f44260f 100644
--- a/editor/libeditor/html/tests/test_root_element_replacement.html
+++ b/editor/libeditor/html/tests/test_root_element_replacement.html
@@ -22,8 +22,6 @@
 SimpleTest.waitForExplicitFinish();
 SimpleTest.waitForFocus(runTest);
 
-netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-
 function runDesignModeTest(aDoc, aFocus, aNewSource)
 {
   aDoc.designMode = "on";
@@ -83,11 +81,9 @@ var gSetFocusToIFrame = false;
 
 function onLoadIFrame()
 {
-  netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
-
   var frameDoc = gIFrame.contentWindow.document;
 
-  var selCon = gIFrame.contentWindow.
+  var selCon = SpecialPowers.wrap(gIFrame).contentWindow.
     QueryInterface(Components.interfaces.nsIInterfaceRequestor).
     getInterface(Components.interfaces.nsIWebNavigation).
     QueryInterface(Components.interfaces.nsIInterfaceRequestor).
diff --git a/layout/base/tests/test_bug449781.html b/layout/base/tests/test_bug449781.html
index 77876d9ae048..149b8ea03209 100644
--- a/layout/base/tests/test_bug449781.html
+++ b/layout/base/tests/test_bug449781.html
@@ -36,9 +36,8 @@ addLoadEvent(function() {
   ok(equal, "Show/hide should have no effect",
      "got " + str1 + " but expected " + str2);
 
-  netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
   var viewer =
-    $("ourFrame").contentWindow
+    SpecialPowers.wrap($("ourFrame")).contentWindow
                  .QueryInterface(Components.interfaces.nsIInterfaceRequestor)
                  .getInterface(Components.interfaces.nsIWebNavigation)
                  .QueryInterface(Components.interfaces.nsIDocShell)