diff --git a/mozilla/layout/base/nsCSSFrameConstructor.cpp b/mozilla/layout/base/nsCSSFrameConstructor.cpp
index 4423a19cc8b..b73766cbbd8 100644
--- a/mozilla/layout/base/nsCSSFrameConstructor.cpp
+++ b/mozilla/layout/base/nsCSSFrameConstructor.cpp
@@ -5946,7 +5946,7 @@ nsCSSFrameConstructor::ConstructXULFrame(nsFrameConstructorState& aState,
 
         newFrame = NS_NewMenuBarFrame(mPresShell, aStyleContext);
       }
-      else if (aTag == nsGkAtoms::popupgroup) {
+      else if (aTag == nsGkAtoms::popupgroup && aContent->IsNativeAnonymous()) {
         // This frame contains child popups
         newFrame = NS_NewPopupSetFrame(mPresShell, aStyleContext);
       }
@@ -6208,7 +6208,7 @@ nsCSSFrameConstructor::ConstructXULFrame(nsFrameConstructorState& aState,
     }
 
 #ifdef MOZ_XUL
-    if (aTag == nsGkAtoms::popupgroup) {
+    if (aTag == nsGkAtoms::popupgroup && aContent->IsNativeAnonymous()) {
       nsIRootBox* rootBox = nsIRootBox::GetRootBox(mPresShell);
       if (rootBox) {
         NS_ASSERTION(rootBox->GetPopupSetFrame() == newFrame,