--- a/widget/nsNativeTheme.cpp
+++ b/widget/nsNativeTheme.cpp
@@ -219,17 +219,18 @@ nsNativeTheme::GetCheckedOrSelected(nsIF
 
 bool
 nsNativeTheme::IsButtonTypeMenu(nsIFrame* aFrame)
 {
   if (!aFrame)
     return false;
 
   nsIContent* content = aFrame->GetContent();
-  return content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
+  return content->IsXULElement(nsGkAtoms::button) &&
+         content->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
                               NS_LITERAL_STRING("menu"), eCaseMatters);
 }
 
 bool
 nsNativeTheme::IsPressedButton(nsIFrame* aFrame)
 {
   EventStates eventState = GetContentState(aFrame, NS_THEME_TOOLBARBUTTON);
   if (IsDisabled(aFrame, eventState))