--- a/dom/base/moz.build
+++ b/dom/base/moz.build
@@ -181,17 +181,16 @@ EXPORTS.mozilla.dom += [
     'FragmentOrElement.h',
     'FromParser.h',
     'GroupedSHistory.h',
     'IdleDeadline.h',
     'IdleRequest.h',
     'ImageEncoder.h',
     'ImageTracker.h',
     'ImportManager.h',
-    'IntlUtils.h',
     'Link.h',
     'Location.h',
     'NameSpaceConstants.h',
     'Navigator.h',
     'NodeInfo.h',
     'NodeInfoInlines.h',
     'NodeIterator.h',
     'PartialSHistory.h',
@@ -255,17 +254,16 @@ UNIFIED_SOURCES += [
     'FormData.cpp',
     'FragmentOrElement.cpp',
     'GroupedSHistory.cpp',
     'IdleDeadline.cpp',
     'IdleRequest.cpp',
     'ImageEncoder.cpp',
     'ImageTracker.cpp',
     'ImportManager.cpp',
-    'IntlUtils.cpp',
     'Link.cpp',
     'Location.cpp',
     'Navigator.cpp',
     'NodeInfo.cpp',
     'NodeIterator.cpp',
     'nsAtomListUtils.cpp',
     'nsAttrAndChildArray.cpp',
     'nsAttrValue.cpp',
@@ -370,16 +368,24 @@ if CONFIG['MOZ_WEBRTC']:
         'nsDOMDataChannel.cpp',
     ]
 
 if CONFIG['FUZZING']:
     UNIFIED_SOURCES += [
         'FuzzingFunctions.cpp',
     ]
 
+if CONFIG['ENABLE_INTL_API']:
+    UNIFIED_SOURCES += [
+        'IntlUtils.cpp',
+    ]
+    EXPORTS.mozilla.dom += [
+        'IntlUtils.h',
+    ]
+
 # these files couldn't be in UNIFIED_SOURCES for now for reasons given below:
 SOURCES += [
     # Several conflicts with other bindings.
     'DOMIntersectionObserver.cpp',
     # Because of OS X headers.
     'nsContentUtils.cpp',
     # this file doesn't like windows.h
     'nsDOMWindowUtils.cpp',

--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -222,17 +222,19 @@
 #include "TimeChangeObserver.h"
 #include "mozilla/dom/AudioContext.h"
 #include "mozilla/dom/BrowserElementDictionariesBinding.h"
 #include "mozilla/dom/cache/CacheStorage.h"
 #include "mozilla/dom/Console.h"
 #include "mozilla/dom/Fetch.h"
 #include "mozilla/dom/FunctionBinding.h"
 #include "mozilla/dom/HashChangeEvent.h"
+#ifdef ENABLE_INTL_API
 #include "mozilla/dom/IntlUtils.h"
+#endif
 #include "mozilla/dom/MozSelfSupportBinding.h"
 #include "mozilla/dom/PopStateEvent.h"
 #include "mozilla/dom/PopupBlockedEvent.h"
 #include "mozilla/dom/PrimitiveConversions.h"
 #include "mozilla/dom/WindowBinding.h"
 #include "nsITabChild.h"
 #include "mozilla/dom/MediaQueryList.h"
 #include "mozilla/dom/ScriptSettings.h"
@@ -1916,17 +1918,19 @@ nsGlobalWindow::CleanUp()
 
   if (mIdleTimer) {
     mIdleTimer->Cancel();
     mIdleTimer = nullptr;
   }
 
   mServiceWorkerRegistrationTable.Clear();
 
+#ifdef ENABLE_INTL_API
   mIntlUtils = nullptr;
+#endif
 }
 
 void
 nsGlobalWindow::ClearControllers()
 {
   if (mControllers) {
     uint32_t count;
     mControllers->GetControllerCount(&count);
@@ -2207,17 +2211,19 @@ NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mScrollbars)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mCrypto)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mU2F)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mConsole)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAudioWorklet)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPaintWorklet)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mExternal)
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mMozSelfSupport)
+#ifdef ENABLE_INTL_API
   NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mIntlUtils)
+#endif
 
   tmp->TraverseHostObjectURIs(cb);
 NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
 
 NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsGlobalWindow)
   nsGlobalWindow::CleanupCachedXBLHandlers(tmp);
 
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mContext)
@@ -2282,17 +2288,19 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ns
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mScrollbars)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mCrypto)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mU2F)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mConsole)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mAudioWorklet)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mPaintWorklet)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mExternal)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mMozSelfSupport)
+#ifdef ENABLE_INTL_API
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mIntlUtils)
+#endif
 
   tmp->UnlinkHostObjectURIs();
 
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mIdleRequestExecutor)
   tmp->DisableIdleCallbackRequests();
 
   NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
 NS_IMPL_CYCLE_COLLECTION_UNLINK_END
@@ -14926,24 +14934,25 @@ nsGlobalWindow::GetAppLocales(nsTArray<n
   nsTArray<nsCString> appLocales;
   mozilla::intl::LocaleService::GetInstance()->GetAppLocales(appLocales);
 
   for (uint32_t i = 0; i < appLocales.Length(); i++) {
     aLocales.AppendElement(NS_ConvertUTF8toUTF16(appLocales[i]));
   }
 }
 
+#ifdef ENABLE_INTL_API
 IntlUtils*
 nsGlobalWindow::GetIntlUtils(ErrorResult& aError)
 {
   MOZ_RELEASE_ASSERT(IsInnerWindow());
 
   if (!mIntlUtils) {
     mIntlUtils = new IntlUtils(AsInner());
   }
 
   return mIntlUtils;
 }
-
+#endif
 
 template class nsPIDOMWindow<mozIDOMWindowProxy>;
 template class nsPIDOMWindow<mozIDOMWindow>;
 template class nsPIDOMWindow<nsISupports>;

--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -117,17 +117,19 @@ class CustomElementRegistry;
 class DocGroup;
 class External;
 class Function;
 class Gamepad;
 enum class ImageBitmapFormat : uint8_t;
 class IdleRequest;
 class IdleRequestCallback;
 class IncrementalRunnable;
+#ifdef ENABLE_INTL_API
 class IntlUtils;
+#endif
 class Location;
 class MediaQueryList;
 class MozSelfSupport;
 class Navigator;
 class OwningExternalOrWindowProxy;
 class Promise;
 class PostMessageEvent;
 struct RequestInit;
@@ -946,18 +948,20 @@ public:
   GetAudioWorklet(mozilla::ErrorResult& aRv);
 
   mozilla::dom::Worklet*
   GetPaintWorklet(mozilla::ErrorResult& aRv);
 
   void
   GetAppLocales(nsTArray<nsString>& aLocales);
 
+#ifdef ENABLE_INTL_API
   mozilla::dom::IntlUtils*
   GetIntlUtils(mozilla::ErrorResult& aRv);
+#endif
 
 protected:
   bool AlertOrConfirm(bool aAlert, const nsAString& aMessage,
                       nsIPrincipal& aSubjectPrincipal,
                       mozilla::ErrorResult& aError);
 
 public:
   void Alert(nsIPrincipal& aSubjectPrincipal,
@@ -2031,17 +2035,19 @@ protected:
   // This is the CC generation the last time we called CanSkip.
   uint32_t mCanSkipCCGeneration;
 
   // The VR Displays for this window
   nsTArray<RefPtr<mozilla::dom::VRDisplay>> mVRDisplays;
 
   RefPtr<mozilla::dom::VREventObserver> mVREventObserver;
 
+#ifdef ENABLE_INTL_API
   RefPtr<mozilla::dom::IntlUtils> mIntlUtils;
+#endif
 
   friend class nsDOMScriptableHelper;
   friend class nsDOMWindowUtils;
   friend class mozilla::dom::PostMessageEvent;
   friend class DesktopNotification;
   friend class mozilla::dom::TimeoutManager;
   friend class IdleRequestExecutor;
 

--- a/dom/webidl/Window.webidl
+++ b/dom/webidl/Window.webidl
@@ -529,15 +529,17 @@ partial interface Window {
    *
    * This API always returns at least one locale.
    *
    * Example: ["en-US", "de", "pl", "sr-Cyrl", "zh-Hans-HK"]
    */
   [Func="IsChromeOrXBL"]
   sequence<DOMString> getAppLocales();
 
+#ifdef ENABLE_INTL_API
   /**
    * Getter funcion for IntlUtils, which provides helper functions for
    * localization.
    */
   [Throws, Func="IsChromeOrXBL"]
   readonly attribute IntlUtils intlUtils;
+#endif
 };

--- a/dom/webidl/moz.build
+++ b/dom/webidl/moz.build
@@ -644,17 +644,16 @@ WEBIDL_FILES = [
     'ImageBitmap.webidl',
     'ImageBitmapRenderingContext.webidl',
     'ImageCapture.webidl',
     'ImageData.webidl',
     'ImageDocument.webidl',
     'InputEvent.webidl',
     'InspectorUtils.webidl',
     'IntersectionObserver.webidl',
-    'IntlUtils.webidl',
     'IterableIterator.webidl',
     'KeyAlgorithm.webidl',
     'KeyboardEvent.webidl',
     'KeyEvent.webidl',
     'KeyframeAnimationOptions.webidl',
     'KeyframeEffect.webidl',
     'KeyIdsInitData.webidl',
     'LegacyQueryInterface.webidl',
@@ -1131,8 +1130,13 @@ if CONFIG['MOZ_B2G']:
     GENERATED_EVENTS_WEBIDL_FILES += [
         'MozApplicationEvent.webidl'
     ]
 
 if CONFIG['ACCESSIBILITY']:
     WEBIDL_FILES += [
         'AccessibleNode.webidl',
     ]
+
+if CONFIG['ENABLE_INTL_API']:
+    WEBIDL_FILES += [
+        'IntlUtils.webidl',
+    ]