--- a/layout/base/PresShell.cpp
+++ b/layout/base/PresShell.cpp
@@ -11017,16 +11017,18 @@ nsIPresShell::SetGlobalZoom(const float&
 
   if (nsLayoutUtils::BrowserGlobalZoomFull()) {
     cv->SetFullZoom(aZoomFactor);
     cv->SetTextZoom(1.0f);
   } else {
     cv->SetFullZoom(1.0f);
     cv->SetTextZoom(aZoomFactor);
   }
+
+  PRES_LOG("%p: SetGlobalZoom end\n", this);
 }
 
 void
 PresShell::PausePainting()
 {
   if (GetPresContext()->RefreshDriver()->GetPresContext() != GetPresContext())
     return;