--- a/gfx/layers/wr/WebRenderLayerManager.cpp
+++ b/gfx/layers/wr/WebRenderLayerManager.cpp
@@ -261,23 +261,28 @@ WebRenderLayerManager::EndTransactionWit
 
   WrBridge()->BeginTransaction();
 
   LayoutDeviceIntSize size = mWidget->GetClientSize();
   wr::LayoutSize contentSize { (float)size.width, (float)size.height };
   wr::DisplayListBuilder builder(WrBridge()->GetPipeline(), contentSize, mLastDisplayListSize);
   wr::IpcResourceUpdateQueue resourceUpdates(WrBridge());
 
-  mWebRenderCommandBuilder.BuildWebRenderCommands(builder,
-                                                  resourceUpdates,
-                                                  aDisplayList,
-                                                  aDisplayListBuilder,
-                                                  mScrollData,
-                                                  contentSize,
-                                                  aFilters);
+  { // Record the time spent "layerizing". WR doesn't actually layerize but
+    // generating the WR display list is the closest equivalent
+    PaintTelemetry::AutoRecord record(PaintTelemetry::Metric::Layerization);
+
+    mWebRenderCommandBuilder.BuildWebRenderCommands(builder,
+                                                    resourceUpdates,
+                                                    aDisplayList,
+                                                    aDisplayListBuilder,
+                                                    mScrollData,
+                                                    contentSize,
+                                                    aFilters);
+  }
 
   DiscardCompositorAnimations();
 
   mWidget->AddWindowOverlayWebRenderCommands(WrBridge(), builder, resourceUpdates);
   mWindowOverlayChanged = false;
 
 #if DUMP_LISTS
   if (XRE_IsContentProcess()) mScrollData.Dump();