diff --git a/layout/generic/nsContainerFrame.cpp b/layout/generic/nsContainerFrame.cpp
index 32fa623902a7..c481cd67b922 100644
--- a/layout/generic/nsContainerFrame.cpp
+++ b/layout/generic/nsContainerFrame.cpp
@@ -594,8 +594,8 @@ IsTopLevelWidget(nsIWidget* aWidget)
   nsWindowType windowType = aWidget->WindowType();
   return windowType == eWindowType_toplevel ||
          windowType == eWindowType_dialog ||
+         windowType == eWindowType_popup ||
          windowType == eWindowType_sheet;
-  // popups aren't toplevel so they're not handled here
 }
 
 void
diff --git a/toolkit/themes/windows/global/alerts/alert.css b/toolkit/themes/windows/global/alerts/alert.css
index 3510354f7586..7473174ea0d0 100644
--- a/toolkit/themes/windows/global/alerts/alert.css
+++ b/toolkit/themes/windows/global/alerts/alert.css
@@ -10,6 +10,11 @@
 
 @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
 
+#alertNotification {
+  -moz-appearance: none;
+  background: transparent;
+}
+
 #alertBox {
   border: 1px solid ThreeDShadow;
   border-radius: 1px;