diff -r 000000000000 -r 6474c204b198 browser/metro/shell/commandexecutehandler/CEHHelper.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/metro/shell/commandexecutehandler/CEHHelper.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,182 @@
+/* -*- Mode: C++; tab-width: 2; 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 "CEHHelper.h"
+#include <tlhelp32.h>
+#include "mozilla/widget/MetroD3DCheckHelper.h"
+
+#ifdef SHOW_CONSOLE
+#include <io.h> // _open_osfhandle
+#endif
+
+HANDLE sCon;
+LPCWSTR metroDX10Available = L"MetroD3DAvailable";
+LPCWSTR metroLastAHE = L"MetroLastAHE";
+LPCWSTR cehDumpDebugStrings = L"CEHDump";
+extern const WCHAR* kFirefoxExe;
+
+void
+Log(const wchar_t *fmt, ...)
+{
+#if !defined(SHOW_CONSOLE)
+  DWORD dwRes = 0;
+  if (!GetDWORDRegKey(cehDumpDebugStrings, dwRes) || !dwRes) {
+    return;
+  }
+#endif
+  va_list a = nullptr;
+  wchar_t szDebugString[1024];
+  if(!lstrlenW(fmt))
+    return;
+  va_start(a,fmt);
+  vswprintf(szDebugString, 1024, fmt, a);
+  va_end(a);
+  if(!lstrlenW(szDebugString))
+    return;
+
+  DWORD len;
+  WriteConsoleW(sCon, szDebugString, lstrlenW(szDebugString), &len, nullptr);
+  WriteConsoleW(sCon, L"\n", 1, &len, nullptr);
+
+  OutputDebugStringW(szDebugString);
+  OutputDebugStringW(L"\n");
+}
+
+#if defined(SHOW_CONSOLE)
+void
+SetupConsole()
+{
+  FILE *fp;
+  AllocConsole();
+  sCon = GetStdHandle(STD_OUTPUT_HANDLE); 
+  int fd = _open_osfhandle(reinterpret_cast<intptr_t>(sCon), 0);
+  fp = _fdopen(fd, "w");
+  *stdout = *fp;
+  setvbuf(stdout, nullptr, _IONBF, 0);
+}
+#endif
+
+bool
+IsImmersiveProcessDynamic(HANDLE process)
+{
+  HMODULE user32DLL = LoadLibraryW(L"user32.dll");
+  if (!user32DLL) {
+    return false;
+  }
+
+  decltype(IsImmersiveProcess)* IsImmersiveProcessPtr =
+    (decltype(IsImmersiveProcess)*) GetProcAddress(user32DLL,
+                                                   "IsImmersiveProcess");
+  if (!IsImmersiveProcessPtr) {
+    FreeLibrary(user32DLL);
+    return false;
+  }
+
+  BOOL bImmersiveProcess = IsImmersiveProcessPtr(process);
+  FreeLibrary(user32DLL);
+  return bImmersiveProcess;
+}
+
+bool
+IsProcessRunning(const wchar_t *processName, bool bCheckIfMetro)
+{
+  bool exists = false;
+  PROCESSENTRY32W entry;
+  entry.dwSize = sizeof(PROCESSENTRY32W);
+
+  HANDLE snapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
+
+  if (Process32First(snapshot, &entry)) {
+    while (!exists && Process32Next(snapshot, &entry)) {
+      if (!_wcsicmp(entry.szExeFile, processName)) {
+        HANDLE process = OpenProcess(GENERIC_READ, FALSE, entry.th32ProcessID);
+        bool isImmersiveProcess = IsImmersiveProcessDynamic(process);
+        if ((bCheckIfMetro && isImmersiveProcess) ||
+            (!bCheckIfMetro && !isImmersiveProcess)) {
+          exists = true;
+        }
+        CloseHandle(process);
+      }
+    }
+  }
+
+  CloseHandle(snapshot);
+  return exists;
+}
+
+bool
+IsMetroProcessRunning()
+{
+  return IsProcessRunning(kFirefoxExe, true);
+}
+
+bool
+IsDesktopProcessRunning()
+{
+  return IsProcessRunning(kFirefoxExe, false);
+}
+
+/*
+ * Retrieve the last front end ui we launched so we can target it
+ * again. This value is updated down in nsAppRunner when the browser
+ * starts up.
+ */
+AHE_TYPE
+GetLastAHE()
+{
+  DWORD ahe;
+  if (GetDWORDRegKey(metroLastAHE, ahe)) {
+    return (AHE_TYPE) ahe;
+  }
+  return AHE_DESKTOP;
+}
+
+bool
+IsDX10Available()
+{
+  DWORD isDX10Available;
+  if (GetDWORDRegKey(metroDX10Available, isDX10Available)) {
+    return isDX10Available;
+  }
+  bool check = D3DFeatureLevelCheck();
+  SetDWORDRegKey(metroDX10Available, check);
+  return check;
+}
+
+bool
+GetDWORDRegKey(LPCWSTR name, DWORD &value)
+{
+  HKEY key;
+  LONG result = RegOpenKeyExW(HKEY_CURRENT_USER, L"SOFTWARE\\Mozilla\\Firefox",
+                              0, KEY_READ, &key);
+  if (result != ERROR_SUCCESS) {
+    return false;
+  }
+
+  DWORD bufferSize = sizeof(DWORD);
+  DWORD type;
+  result = RegQueryValueExW(key, name, nullptr, &type,
+                            reinterpret_cast<LPBYTE>(&value),
+                            &bufferSize);
+  RegCloseKey(key);
+  return result == ERROR_SUCCESS;
+}
+
+bool
+SetDWORDRegKey(LPCWSTR name, DWORD value)
+{
+  HKEY key;
+  LONG result = RegOpenKeyExW(HKEY_CURRENT_USER, L"SOFTWARE\\Mozilla\\Firefox",
+                              0, KEY_WRITE, &key);
+  if (result != ERROR_SUCCESS) {
+    return false;
+  }
+
+  result = RegSetValueEx(key, name, 0, REG_DWORD,
+                         reinterpret_cast<LPBYTE>(&value),
+                         sizeof(DWORD));
+  RegCloseKey(key);
+  return result == ERROR_SUCCESS;
+}