1 files changed, 6 insertions, 4 deletions
diff --git a/dom/base/FragmentOrElement.cpp b/dom/base/FragmentOrElement.cpp
index fde983e7c..9106778df 100644
--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -585,6 +585,12 @@ FragmentOrElement::nsDOMSlots::Traverse(nsCycleCollectionTraversalCallback &cb,
       mCustomElementData->mCallbackQueue[i]->Traverse(cb);
     }
   }
+
+  for (auto iter = mRegisteredIntersectionObservers.Iter(); !iter.Done(); iter.Next()) {
+    DOMIntersectionObserver* observer = iter.Key();
+    NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mSlots->mRegisteredIntersectionObservers[i]");
+    cb.NoteXPCOMChild(observer);
+  }
 }
 
 void
@@ -1872,10 +1878,6 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(FragmentOrElement)
     NS_IMPL_CYCLE_COLLECTION_DESCRIBE(FragmentOrElement, tmp->mRefCnt.get())
   }
 
-  // Always need to traverse script objects, so do that before we check
-  // if we're uncollectable.
-  NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
-
   if (!nsINode::Traverse(tmp, cb)) {
     return NS_SUCCESS_INTERRUPTED_TRAVERSE;
   }