1 files changed, 6 insertions, 4 deletions
diff --git a/layout/generic/nsContainerFrame.cpp b/layout/generic/nsContainerFrame.cpp
index 835ba9b262..47afed9de1 100644
--- a/layout/generic/nsContainerFrame.cpp
+++ b/layout/generic/nsContainerFrame.cpp
@@ -1891,10 +1891,12 @@ nsContainerFrame::RenumberFrameAndDescendants(int32_t* aOrdinal,
   }
 
   // Do not renumber list for summary elements.
-  HTMLSummaryElement* summary =
-    HTMLSummaryElement::FromContent(kid->GetContent());
-  if (summary && summary->IsMainSummary()) {
-    return false;
+  if (HTMLDetailsElement::IsDetailsEnabled()) {
+    HTMLSummaryElement* summary =
+      HTMLSummaryElement::FromContent(kid->GetContent());
+    if (summary && summary->IsMainSummary()) {
+      return false;
+    }
   }
 
   bool kidRenumberedABullet = false;