--- a/dom/base/Element.cpp
+++ b/dom/base/Element.cpp
@@ -3785,30 +3785,23 @@ void Element::UnlinkIntersectionObserver
   RemoveProperty(nsGkAtoms::intersectionobserverlist);
 }
 
 bool Element::UpdateIntersectionObservation(DOMIntersectionObserver* aObserver,
                                             int32_t aThreshold) {
   auto* observers = static_cast<IntersectionObserverList*>(
       GetProperty(nsGkAtoms::intersectionobserverlist));
   if (!observers) {
-    printf("%s %d\n", __func__, __LINE__);
     return false;
   }
   bool updated = false;
   if (auto entry = observers->Lookup(aObserver)) {
     updated = entry.Data() != aThreshold;
-    printf("%d \t", entry.Data());
     entry.Data() = aThreshold;
   }
-  nsAutoString id;
-  GetId(id);
-  printf("%s %s %d %d t:%d\n",
-         NS_ConvertUTF16toUTF8(id).get(),
-          __func__, __LINE__, updated, aThreshold);
   return updated;
 }
 
 template <class T>
 void Element::GetCustomInterface(nsGetterAddRefs<T> aResult) {
   nsCOMPtr<nsISupports> iface = CustomElementRegistry::CallGetCustomInterface(
       this, NS_GET_TEMPLATE_IID(T));
   if (iface) {