--- a/layout/painting/nsDisplayList.cpp
+++ b/layout/painting/nsDisplayList.cpp
@@ -704,18 +704,19 @@ nsDisplayListBuilder::AddAnimationsAndTr
   // UpdateOpacityLayer/UpdateTransformLayer hints.
   MOZ_ASSERT(!aBuilder == !aItem,
              "should only be called in two configurations, with both "
              "aBuilder and aItem, or with neither");
   MOZ_ASSERT(!aItem || aFrame == aItem->Frame(), "frame mismatch");
 
   // Only send animations to a layer that is actually using
   // off-main-thread compositing.
-  if (aLayer->Manager()->GetBackendType() !=
-        layers::LayersBackend::LAYERS_CLIENT) {
+  LayersBackend backend = aLayer->Manager()->GetBackendType();
+  if (!(backend == layers::LayersBackend::LAYERS_CLIENT ||
+        backend == layers::LayersBackend::LAYERS_WR)) {
     return;
   }
 
   bool pending = !aBuilder;
 
   if (pending) {
     aLayer->ClearAnimationsForNextTransaction();
   } else {