diff --git a/ipc/app/moz.build b/ipc/app/moz.build
index 4bcae9684924..2dbc8084ca61 100644
--- a/ipc/app/moz.build
+++ b/ipc/app/moz.build
@@ -48,6 +48,10 @@ if CONFIG['OS_ARCH'] == 'WINNT':
             'winmm.dll',
             'user32.dll',
         ]
+
+    OS_LIBS += [
+        'ntdll',
+    ]
 
     DELAYLOAD_DLLS += [
         'xul.dll',
diff --git a/js/xpconnect/shell/moz.build b/js/xpconnect/shell/moz.build
index 499b74ad1f59..04e007c58dbe 100644
--- a/js/xpconnect/shell/moz.build
+++ b/js/xpconnect/shell/moz.build
@@ -50,6 +50,10 @@ if CONFIG['OS_ARCH'] == 'WINNT':
             'user32.dll',
         ]
 
+    OS_LIBS += [
+        'ntdll',
+    ]
+
     DELAYLOAD_DLLS += [
         'xul.dll',
     ]
diff --git a/mozglue/misc/NativeNt.h b/mozglue/misc/NativeNt.h
index ae79e17d6736..501adc949e6b 100644
--- a/mozglue/misc/NativeNt.h
+++ b/mozglue/misc/NativeNt.h
@@ -89,6 +89,9 @@ VOID NTAPI RtlAcquireSRWLockShared(PSRWLOCK aLock);
 VOID NTAPI RtlReleaseSRWLockExclusive(PSRWLOCK aLock);
 VOID NTAPI RtlReleaseSRWLockShared(PSRWLOCK aLock);
 
+ULONG NTAPI RtlNtStatusToDosError(NTSTATUS aStatus);
+VOID NTAPI RtlSetLastWin32Error(DWORD aError);
+
 NTSTATUS NTAPI NtReadVirtualMemory(HANDLE aProcessHandle, PVOID aBaseAddress,
                                    PVOID aBuffer, SIZE_T aNumBytesToRead,
                                    PSIZE_T aNumBytesRead);
@@ -1099,6 +1102,8 @@ inline DWORD RtlGetCurrentThreadId() {
                             0xFFFFFFFFUL);
 }
 
+const HANDLE kCurrentProcess = reinterpret_cast<HANDLE>(-1);
+
 inline LauncherResult<DWORD> GetParentProcessId() {
   struct PROCESS_BASIC_INFORMATION {
     NTSTATUS ExitStatus;
@@ -1109,7 +1114,6 @@ inline LauncherResult<DWORD> GetParentProcessId() {
     ULONG_PTR InheritedFromUniqueProcessId;
   };
 
-  const HANDLE kCurrentProcess = reinterpret_cast<HANDLE>(-1);
   ULONG returnLength;
   PROCESS_BASIC_INFORMATION pbi = {};
   NTSTATUS status =
@@ -1122,6 +1126,30 @@ inline LauncherResult<DWORD> GetParentProcessId() {
   return static_cast<DWORD>(pbi.InheritedFromUniqueProcessId & 0xFFFFFFFF);
 }
 
+inline SIZE_T WINAPI VirtualQueryEx(HANDLE aProcess, LPCVOID aAddress,
+                                    PMEMORY_BASIC_INFORMATION aMemInfo,
+                                    SIZE_T aMemInfoLen) {
+#if defined(MOZILLA_INTERNAL_API)
+  return ::VirtualQueryEx(aProcess, aAddress, aMemInfo, aMemInfoLen);
+#else
+  SIZE_T returnedLength;
+  NTSTATUS status = ::NtQueryVirtualMemory(
+      aProcess, const_cast<PVOID>(aAddress), MemoryBasicInformation, aMemInfo,
+      aMemInfoLen, &returnedLength);
+  if (!NT_SUCCESS(status)) {
+    ::RtlSetLastWin32Error(::RtlNtStatusToDosError(status));
+    returnedLength = 0;
+  }
+  return returnedLength;
+#endif  // defined(MOZILLA_INTERNAL_API)
+}
+
+inline SIZE_T WINAPI VirtualQuery(LPCVOID aAddress,
+                                  PMEMORY_BASIC_INFORMATION aMemInfo,
+                                  SIZE_T aMemInfoLen) {
+  return nt::VirtualQueryEx(kCurrentProcess, aAddress, aMemInfo, aMemInfoLen);
+}
+
 struct DataDirectoryEntry : public _IMAGE_DATA_DIRECTORY {
   DataDirectoryEntry() : _IMAGE_DATA_DIRECTORY() {}
 
diff --git a/mozglue/misc/interceptor/MMPolicies.h b/mozglue/misc/interceptor/MMPolicies.h
index a86bbc907155..cebb8e5bdcf8 100644
--- a/mozglue/misc/interceptor/MMPolicies.h
+++ b/mozglue/misc/interceptor/MMPolicies.h
@@ -74,6 +74,19 @@ PVOID WINAPI MapViewOfFile3(HANDLE FileMapping, HANDLE Process,
 extern "C" errno_t rand_s(unsigned int* randomValue);
 #endif  // !defined(_CRT_RAND_S)
 
+// Declaring only the functions we need in NativeNt.h.  To include the entire
+// NativeNt.h causes circular dependency.
+namespace mozilla {
+namespace nt {
+SIZE_T WINAPI VirtualQueryEx(HANDLE aProcess, LPCVOID aAddress,
+                             PMEMORY_BASIC_INFORMATION aMemInfo,
+                             SIZE_T aMemInfoLen);
+
+SIZE_T WINAPI VirtualQuery(LPCVOID aAddress, PMEMORY_BASIC_INFORMATION aMemInfo,
+                           SIZE_T aMemInfoLen);
+}  // namespace nt
+}  // namespace mozilla
+
 namespace mozilla {
 namespace interceptor {
 
@@ -276,7 +289,7 @@ class MOZ_TRIVIAL_CTOR_DTOR MMPolicyBase {
     // Scan the range for a free chunk that is at least as large as
     // aDesiredBytesLen
     while (address <= kMaxPtr &&
-           ::VirtualQueryEx(aProcess, address, &mbi, len)) {
+           nt::VirtualQueryEx(aProcess, address, &mbi, len)) {
       if (mbi.State == MEM_FREE && mbi.RegionSize >= aDesiredBytesLen) {
         return mbi.BaseAddress;
       }
@@ -424,7 +437,7 @@ class MOZ_TRIVIAL_CTOR_DTOR MMPolicyInProcess : public MMPolicyBase {
    */
   bool IsPageAccessible(void* aVAddress) const {
     MEMORY_BASIC_INFORMATION mbi;
-    SIZE_T result = ::VirtualQuery(aVAddress, &mbi, sizeof(mbi));
+    SIZE_T result = nt::VirtualQuery(aVAddress, &mbi, sizeof(mbi));
 
     return result && mbi.AllocationProtect && (mbi.Type & MEM_IMAGE) &&
            mbi.State == MEM_COMMIT && mbi.Protect != PAGE_NOACCESS;
@@ -696,7 +709,7 @@ class MMPolicyOutOfProcess : public MMPolicyBase {
    */
   bool IsPageAccessible(void* aVAddress) const {
     MEMORY_BASIC_INFORMATION mbi;
-    SIZE_T result = ::VirtualQueryEx(mProcess, aVAddress, &mbi, sizeof(mbi));
+    SIZE_T result = nt::VirtualQueryEx(mProcess, aVAddress, &mbi, sizeof(mbi));
 
     return result && mbi.AllocationProtect && (mbi.Type & MEM_IMAGE) &&
            mbi.State == MEM_COMMIT && mbi.Protect != PAGE_NOACCESS;
diff --git a/mozglue/tests/TestNativeNt.cpp b/mozglue/tests/TestNativeNt.cpp
index bab7e28af421..01ed03da66de 100644
--- a/mozglue/tests/TestNativeNt.cpp
+++ b/mozglue/tests/TestNativeNt.cpp
@@ -41,6 +41,29 @@ const char kFailFmt[] =
 using namespace mozilla;
 using namespace mozilla::nt;
 
+bool TestVirtualQuery(HANDLE aProcess, LPCVOID aAddress) {
+  MEMORY_BASIC_INFORMATION info1 = {}, info2 = {};
+  SIZE_T result1 = ::VirtualQueryEx(aProcess, aAddress, &info1, sizeof(info1)),
+         result2 = mozilla::nt::VirtualQueryEx(aProcess, aAddress, &info2,
+                                               sizeof(info2));
+  if (result1 != result2) {
+    printf("TEST-FAILED | NativeNt | The returned values mismatch\n");
+    return false;
+  }
+
+  if (!result1) {
+    // Both APIs failed.
+    return true;
+  }
+
+  if (memcmp(&info1, &info2, result1) != 0) {
+    printf("TEST-FAILED | NativeNt | The returned structures mismatch\n");
+    return false;
+  }
+
+  return true;
+}
+
 // Need a non-inline function to bypass compiler optimization that the thread
 // local storage pointer is cached in a register before accessing a thread-local
 // variable.
@@ -226,6 +249,23 @@ int wmain(int argc, wchar_t* argv[]) {
     return 1;
   }
 
+  // To test the Ex version of API, we purposely get a real handle
+  // instead of a pseudo handle.
+  nsAutoHandle process(
+      ::OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, GetCurrentProcessId()));
+  if (!process) {
+    printf("TEST-FAILED | NativeNt | OpenProcess() failed - %08lx\n",
+           ::GetLastError());
+    return 1;
+  }
+
+  // Test Null page, Heap, Mapped image, and Invalid handle
+  if (!TestVirtualQuery(process, nullptr) || !TestVirtualQuery(process, argv) ||
+      !TestVirtualQuery(process, kNormal) ||
+      !TestVirtualQuery(nullptr, kNormal)) {
+    return 1;
+  }
+
   printf("TEST-PASS | NativeNt | All tests ran successfully\n");
   return 0;
 }