diff --git a/docshell/base/nsDocShell.cpp b/docshell/base/nsDocShell.cpp
index b7f782de70a6..68775674ed11 100644
--- a/docshell/base/nsDocShell.cpp
+++ b/docshell/base/nsDocShell.cpp
@@ -194,6 +194,11 @@ static NS_DEFINE_CID(kAppShellCID, NS_APPSHELL_CID);
 #define DEBUG_PAGE_CACHE
 #endif
 
+#ifdef XP_WIN
+#include <process.h>
+#define getpid _getpid
+#endif
+
 using namespace mozilla;
 using namespace mozilla::dom;
 
@@ -795,8 +800,11 @@ nsDocShell::nsDocShell():
   // We're counting the number of |nsDocShells| to help find leaks
   ++gNumberOfDocShells;
   if (!PR_GetEnv("MOZ_QUIET")) {
-      printf("++DOCSHELL %p == %ld [id = %llu]\n", (void*) this,
-             gNumberOfDocShells, SafeCast<unsigned long long>(mHistoryID));
+      printf_stderr("++DOCSHELL %p == %ld [pid = %d] [id = %llu]\n",
+                    (void*) this,
+                    gNumberOfDocShells,
+                    getpid(),
+                    SafeCast<unsigned long long>(mHistoryID));
   }
 #endif
 }
@@ -824,8 +832,11 @@ nsDocShell::~nsDocShell()
     // We're counting the number of |nsDocShells| to help find leaks
     --gNumberOfDocShells;
     if (!PR_GetEnv("MOZ_QUIET")) {
-        printf("--DOCSHELL %p == %ld [id = %llu]\n", (void*) this,
-               gNumberOfDocShells, SafeCast<unsigned long long>(mHistoryID));
+        printf_stderr("--DOCSHELL %p == %ld [pid = %d] [id = %llu]\n",
+                      (void*) this,
+                      gNumberOfDocShells,
+                      getpid(),
+                      SafeCast<unsigned long long>(mHistoryID));
     }
 #endif
 }
diff --git a/dom/base/nsGlobalWindow.cpp b/dom/base/nsGlobalWindow.cpp
index 8431f2d00175..f37871724d24 100644
--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -237,6 +237,11 @@ class nsIScriptTimeoutHandler;
 static PRLogModuleInfo* gDOMLeakPRLog;
 #endif
 
+#ifdef XP_WIN
+#include <process.h>
+#define getpid _getpid
+#endif
+
 static const char kStorageEnabled[] = "dom.storage.enabled";
 
 using namespace mozilla;
@@ -1121,10 +1126,12 @@ nsGlobalWindow::nsGlobalWindow(nsGlobalWindow *aOuterWindow)
 
 #ifdef DEBUG
   if (!PR_GetEnv("MOZ_QUIET")) {
-    printf("++DOMWINDOW == %d (%p) [serial = %d] [outer = %p]\n", gRefCnt,
-           static_cast<void*>(static_cast<nsIScriptGlobalObject*>(this)),
-           gSerialCounter,
-           static_cast<void*>(static_cast<nsIScriptGlobalObject*>(aOuterWindow)));
+    printf_stderr("++DOMWINDOW == %d (%p) [pid = %d] [serial = %d] [outer = %p]\n",
+                  gRefCnt,
+                  static_cast<void*>(static_cast<nsIScriptGlobalObject*>(this)),
+                  getpid(),
+                  gSerialCounter,
+                  static_cast<void*>(static_cast<nsIScriptGlobalObject*>(aOuterWindow)));
   }
 #endif
 
@@ -1197,9 +1204,13 @@ nsGlobalWindow::~nsGlobalWindow()
     }
 
     nsGlobalWindow* outer = static_cast<nsGlobalWindow*>(mOuterWindow.get());
-    printf("--DOMWINDOW == %d (%p) [serial = %d] [outer = %p] [url = %s]\n",
-           gRefCnt, static_cast<void*>(static_cast<nsIScriptGlobalObject*>(this)),
-           mSerial, static_cast<void*>(static_cast<nsIScriptGlobalObject*>(outer)), url.get());
+    printf_stderr("--DOMWINDOW == %d (%p) [pid = %d] [serial = %d] [outer = %p] [url = %s]\n",
+                  gRefCnt,
+                  static_cast<void*>(static_cast<nsIScriptGlobalObject*>(this)),
+                  getpid(),
+                  mSerial,
+                  static_cast<void*>(static_cast<nsIScriptGlobalObject*>(outer)),
+                  url.get());
   }
 #endif