diff --git a/browser/app/winlauncher/LauncherProcessWin.cpp b/browser/app/winlauncher/LauncherProcessWin.cpp
index 35f2cb53506b..e4afa97d8594 100644
--- a/browser/app/winlauncher/LauncherProcessWin.cpp
+++ b/browser/app/winlauncher/LauncherProcessWin.cpp
@@ -17,6 +17,7 @@
 #include "mozilla/Maybe.h"
 #include "mozilla/SafeMode.h"
 #include "mozilla/UniquePtr.h"
+#include "mozilla/WindowsConsole.h"
 #include "mozilla/WindowsVersion.h"
 #include "mozilla/WinHeaderOnlyUtils.h"
 #include "nsWindowsHelpers.h"
@@ -219,6 +220,8 @@ Maybe<int> LauncherMain(int& argc, wchar_t* argv[],
     }
   }
 
+  mozilla::UseParentConsole();
+
   if (!SetArgv0ToFullBinaryPath(argv)) {
     HandleLauncherError(LAUNCHER_ERROR_GENERIC());
     return Nothing();
diff --git a/browser/app/winlauncher/moz.build b/browser/app/winlauncher/moz.build
index 1b74cca4d003..ec616ff1c35a 100644
--- a/browser/app/winlauncher/moz.build
+++ b/browser/app/winlauncher/moz.build
@@ -31,6 +31,7 @@ TEST_DIRS += [
 if CONFIG['MOZ_LAUNCHER_PROCESS']:
     UNIFIED_SOURCES += [
         '/toolkit/xre/LauncherRegistryInfo.cpp',
+        '/widget/windows/WindowsConsole.cpp',
     ]
     for var in ('MOZ_APP_BASENAME', 'MOZ_APP_VENDOR'):
         DEFINES[var] = '"%s"' % CONFIG[var]
diff --git a/toolkit/xre/nsAppRunner.h b/toolkit/xre/nsAppRunner.h
index 916580f7cf24..310e30d8a692 100644
--- a/toolkit/xre/nsAppRunner.h
+++ b/toolkit/xre/nsAppRunner.h
@@ -8,6 +8,7 @@
 
 #ifdef XP_WIN
 #  include <windows.h>
+#  include "mozilla/WindowsConsole.h"
 #else
 #  include <limits.h>
 #endif
@@ -100,7 +101,6 @@ void OverrideDefaultLocaleIfNeeded();
 void MozExpectedExit();
 
 #ifdef XP_WIN
-void UseParentConsole();
 
 BOOL WinLaunchChild(const wchar_t* exePath, int argc, char** argv,
                     HANDLE userToken = nullptr, HANDLE* hProcess = nullptr);
diff --git a/toolkit/xre/nsEmbedFunctions.cpp b/toolkit/xre/nsEmbedFunctions.cpp
index 5976b4bfc02f..9ff6077435fc 100644
--- a/toolkit/xre/nsEmbedFunctions.cpp
+++ b/toolkit/xre/nsEmbedFunctions.cpp
@@ -80,6 +80,7 @@
 
 #include "mozilla/ipc/TestShellParent.h"
 #include "mozilla/ipc/XPCShellEnvironment.h"
+#include "mozilla/WindowsConsole.h"
 #include "mozilla/WindowsDllBlocklist.h"
 
 #include "GMPProcessChild.h"
@@ -381,19 +382,7 @@ nsresult XRE_InitChildProcess(int aArgc, char* aArgv[],
   // Try to attach console to the parent process.
   // It will succeed when the parent process is a command line,
   // so that stdio will be displayed in it.
-  if (AttachConsole(ATTACH_PARENT_PROCESS)) {
-    // Change std handles to refer to new console handles.
-    // Before doing so, ensure that stdout/stderr haven't been
-    // redirected to a valid file
-    if (_fileno(stdout) == -1 || _get_osfhandle(fileno(stdout)) == -1)
-      freopen("CONOUT$", "w", stdout);
-    // Merge stderr into CONOUT$ since there isn't any `CONERR$`.
-    // http://msdn.microsoft.com/en-us/library/windows/desktop/ms683231%28v=vs.85%29.aspx
-    if (_fileno(stderr) == -1 || _get_osfhandle(fileno(stderr)) == -1)
-      freopen("CONOUT$", "w", stderr);
-    if (_fileno(stdin) == -1 || _get_osfhandle(fileno(stdin)) == -1)
-      freopen("CONIN$", "r", stdin);
-  }
+  UseParentConsole();
 
 #  if defined(MOZ_SANDBOX)
   if (aChildData->sandboxTargetServices) {
diff --git a/toolkit/xre/nsNativeAppSupportWin.cpp b/toolkit/xre/nsNativeAppSupportWin.cpp
index 7735257d7e0a..881ba02ccd64 100644
--- a/toolkit/xre/nsNativeAppSupportWin.cpp
+++ b/toolkit/xre/nsNativeAppSupportWin.cpp
@@ -6,8 +6,7 @@
 #include "nsNativeAppSupportBase.h"
 #include "nsNativeAppSupportWin.h"
 
-#include <windows.h>
-#include <fcntl.h>
+#include "mozilla/WindowsConsole.h"
 
 using namespace mozilla;
 
@@ -26,25 +25,6 @@ class nsNativeAppSupportWin : public nsNativeAppSupportBase {
   ~nsNativeAppSupportWin() {}
 };  // nsNativeAppSupportWin
 
-void UseParentConsole() {
-  if (AttachConsole(ATTACH_PARENT_PROCESS)) {
-    // Redirect the standard streams to the existing console, but
-    // only if they haven't been redirected to a valid file.
-    // Visual Studio's _fileno() returns -2 for the standard
-    // streams if they aren't associated with an output stream.
-    if (_fileno(stdout) == -2) {
-      freopen("CONOUT$", "w", stdout);
-    }
-    // There is no CONERR$, so use CONOUT$ for stderr as well.
-    if (_fileno(stderr) == -2) {
-      freopen("CONOUT$", "w", stderr);
-    }
-    if (_fileno(stdin) == -2) {
-      freopen("CONIN$", "r", stdin);
-    }
-  }
-}
-
 void nsNativeAppSupportWin::CheckConsole() {
   for (int i = 1; i < gArgc; ++i) {
     if (strcmp("-console", gArgv[i]) == 0 ||
diff --git a/widget/windows/WindowsConsole.cpp b/widget/windows/WindowsConsole.cpp
new file mode 100644
index 000000000000..eafb454109ec
--- /dev/null
+++ b/widget/windows/WindowsConsole.cpp
@@ -0,0 +1,33 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WindowsConsole.h"
+
+#include <windows.h>
+#include <fcntl.h>
+
+namespace mozilla {
+
+// This code attaches the process to the appropriate console.
+void UseParentConsole() {
+  if (AttachConsole(ATTACH_PARENT_PROCESS)) {
+    // Redirect the standard streams to the existing console, but
+    // only if they haven't been redirected to a valid file.
+    // Visual Studio's _fileno() returns -2 for the standard
+    // streams if they aren't associated with an output stream.
+    if (_fileno(stdout) == -2) {
+      freopen("CONOUT$", "w", stdout);
+    }
+    // There is no CONERR$, so use CONOUT$ for stderr as well.
+    if (_fileno(stderr) == -2) {
+      freopen("CONOUT$", "w", stderr);
+    }
+    if (_fileno(stdin) == -2) {
+      freopen("CONIN$", "r", stdin);
+    }
+  }
+}
+
+}  // namespace mozilla
diff --git a/widget/windows/WindowsConsole.h b/widget/windows/WindowsConsole.h
new file mode 100644
index 000000000000..4b8ecf182310
--- /dev/null
+++ b/widget/windows/WindowsConsole.h
@@ -0,0 +1,16 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_WindowsConsole_h
+#define mozilla_WindowsConsole_h
+
+namespace mozilla {
+
+// This code attaches the process to the appropriate console.
+void UseParentConsole();
+
+}  // namespace mozilla
+
+#endif  // mozilla_WindowsConsole_h
diff --git a/widget/windows/moz.build b/widget/windows/moz.build
index edb683ebd85d..9a924b934d7c 100644
--- a/widget/windows/moz.build
+++ b/widget/windows/moz.build
@@ -19,6 +19,7 @@ EXPORTS += [
 ]
 
 EXPORTS.mozilla += [
+    'WindowsConsole.h',
     'WinHeaderOnlyUtils.h',
 ]
 
@@ -75,6 +76,7 @@ UNIFIED_SOURCES += [
     'WidgetTraceEvent.cpp',
     'WinCompositorWindowThread.cpp',
     'WindowHook.cpp',
+    'WindowsConsole.cpp',
     'WinIMEHandler.cpp',
     'WinPointerEvents.cpp',
     'WinTaskbar.cpp',