diff --git a/toolkit/mozapps/extensions/test/browser/browser_bug577990.js b/toolkit/mozapps/extensions/test/browser/browser_bug577990.js
index 4f0bd4a4567..f8d9daf2b08 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_bug577990.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_bug577990.js
@@ -15,6 +15,12 @@ var gInstallProperties = [{
 }];
 
 function test() {
+  try {
+    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+    if (Components.classes["@mozilla.org/gfx/info;1"].getService(Components.interfaces.nsIGfxInfo).D2DEnabled) {
+      requestLongerTimeout(2);
+    }
+  } catch(e) {}
   waitForExplicitFinish();
 
   gProvider = new MockProvider();
diff --git a/toolkit/mozapps/extensions/test/browser/browser_uninstalling.js b/toolkit/mozapps/extensions/test/browser/browser_uninstalling.js
index 8d8ae0bdfe7..1fc44056b05 100644
--- a/toolkit/mozapps/extensions/test/browser/browser_uninstalling.js
+++ b/toolkit/mozapps/extensions/test/browser/browser_uninstalling.js
@@ -10,6 +10,7 @@ var gCategoryUtilities;
 var gProvider;
 
 function test() {
+  requestLongerTimeout(2);
   waitForExplicitFinish();
 
   gProvider = new MockProvider();