--- a/layout/style/nsAnimationManager.cpp
+++ b/layout/style/nsAnimationManager.cpp
@@ -438,22 +438,16 @@ nsAnimationManager::UpdateAnimations(nsS
   }
   collection->mAnimations.SwapElements(newAnimations);
 
   // Cancel removed animations
   for (size_t newAnimIdx = newAnimations.Length(); newAnimIdx-- != 0; ) {
     newAnimations[newAnimIdx]->CancelFromStyle();
   }
 
-  mPresContext->EffectCompositor()->
-    MaybeUpdateAnimationRule(aElement,
-                             aStyleContext->GetPseudoType(),
-                             EffectCompositor::CascadeLevel::Animations,
-                             aStyleContext);
-
   // We don't actually dispatch the pending events now.  We'll either
   // dispatch them the next time we get a refresh driver notification
   // or the next time somebody calls
   // nsPresShell::FlushPendingNotifications.
   if (mEventDispatcher.HasQueuedEvents()) {
     mPresContext->Document()->SetNeedStyleFlush();
   }
 }