--- a/gfx/layers/Layers.cpp
+++ b/gfx/layers/Layers.cpp
@@ -1987,16 +1987,19 @@ Layer::PrintInfo(std::stringstream& aStr
     aStream << nsPrintfCString(" [mMaskLayer=%p]", mMaskLayer.get()).get();
   }
   for (uint32_t i = 0; i < mScrollMetadata.Length(); i++) {
     if (!mScrollMetadata[i].IsDefault()) {
       aStream << nsPrintfCString(" [metrics%d=", i).get();
       AppendToString(aStream, mScrollMetadata[i], "", "]");
     }
   }
+  if (!mAnimations.IsEmpty()) {
+    aStream << nsPrintfCString(" [%d animations]", (int) mAnimations.Length()).get();
+  }
 }
 
 // The static helper function sets the transform matrix into the packet
 static void
 DumpTransform(layerscope::LayersPacket::Layer::Matrix* aLayerMatrix, const Matrix4x4& aMatrix)
 {
   aLayerMatrix->set_is2d(aMatrix.Is2D());
   if (aMatrix.Is2D()) {