--- a/gfx/2d/DrawTargetRecording.cpp
+++ b/gfx/2d/DrawTargetRecording.cpp
@@ -580,20 +580,20 @@ DrawTargetRecording::PushLayer(bool aOpa
                                SourceSurface* aMask,
                                const Matrix& aMaskTransform,
                                const IntRect& aBounds, bool aCopyBackground)
 {
   if (aMask) {
     EnsureSurfaceStored(mRecorder, aMask, "PushLayer");
   }
 
-  mRecorder->RecordEvent(RecordedPushLayer(this, aOpacity, aOpacity, aMask,
+  mRecorder->RecordEvent(RecordedPushLayer(this, aOpaque, aOpacity, aMask,
                                            aMaskTransform, aBounds,
                                            aCopyBackground));
-  mFinalDT->PushLayer(aOpacity, aOpacity, aMask, aMaskTransform, aBounds,
+  mFinalDT->PushLayer(aOpaque, aOpacity, aMask, aMaskTransform, aBounds,
                       aCopyBackground);
 }
 
 void
 DrawTargetRecording::PopLayer()
 {
   mRecorder->RecordEvent(RecordedPopLayer(this));
   mFinalDT->PopLayer();