diff --git a/React/CxxBridge/RCTCxxBridge.mm b/React/CxxBridge/RCTCxxBridge.mm
index 6fa081399..d820d2f10 100644
--- a/React/CxxBridge/RCTCxxBridge.mm
+++ b/React/CxxBridge/RCTCxxBridge.mm
@@ -338,7 +338,6 @@ struct RCTInstanceCallback : public InstanceCallback {
   #if RCT_PROFILE
         ("StartSamplingProfilerOnInit", (bool)self.devSettings.startSamplingProfilerOnLaunch)
   #endif
-         , nullptr
       ));
     }
   } else {
diff --git a/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.cpp b/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.cpp
index 5208152f5..20da272c7 100644
--- a/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.cpp
+++ b/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.cpp
@@ -113,9 +113,9 @@ void injectJSCExecutorAndroidPlatform() {
 }
 
 std::unique_ptr<JSExecutorFactory> makeAndroidJSCExecutorFactory(
-    const folly::dynamic& jscConfig, NativeExtensionsProvider nativeExtensionsProvider) {
+    const folly::dynamic& jscConfig) {
   detail::injectJSCExecutorAndroidPlatform();
-  return folly::make_unique<JSCExecutorFactory>(std::move(jscConfig), std::move(nativeExtensionsProvider));
+  return folly::make_unique<JSCExecutorFactory>(std::move(jscConfig));
 }
 
 }
diff --git a/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.h b/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.h
index 5de2f99ee..8ad7a34df 100644
--- a/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.h
+++ b/ReactAndroid/src/main/jni/react/jni/AndroidJSCFactory.h
@@ -24,7 +24,7 @@ void injectJSCExecutorAndroidPlatform();
 }
 
 std::unique_ptr<JSExecutorFactory> makeAndroidJSCExecutorFactory(
-    const folly::dynamic& jscConfig, NativeExtensionsProvider nativeExtensionsProvider);
+    const folly::dynamic& jscConfig);
 
 }
 }
diff --git a/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp b/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp
index 7e7184e71..662c8bdf2 100644
--- a/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp
+++ b/ReactAndroid/src/main/jni/react/jni/OnLoad.cpp
@@ -34,7 +34,7 @@ class JSCJavaScriptExecutorHolder : public HybridClass<JSCJavaScriptExecutorHold
   static constexpr auto kJavaDescriptor = "Lcom/facebook/react/bridge/JSCJavaScriptExecutor;";
 
   static local_ref<jhybriddata> initHybrid(alias_ref<jclass>, ReadableNativeMap* jscConfig) {
-    return makeCxxInstance(makeAndroidJSCExecutorFactory(jscConfig->consume(), nullptr));
+    return makeCxxInstance(makeAndroidJSCExecutorFactory(jscConfig->consume()));
   }
 
   static void registerNatives() {
diff --git a/ReactCommon/cxxreact/JSCExecutor.cpp b/ReactCommon/cxxreact/JSCExecutor.cpp
index 2f1f24fd9..3c66fb39e 100644
--- a/ReactCommon/cxxreact/JSCExecutor.cpp
+++ b/ReactCommon/cxxreact/JSCExecutor.cpp
@@ -120,19 +120,17 @@ std::unique_ptr<JSExecutor> JSCExecutorFactory::createJSExecutor(
     std::shared_ptr<ExecutorDelegate> delegate,
     std::shared_ptr<MessageQueueThread> jsQueue) {
   return folly::make_unique<JSCExecutor>(
-      delegate, jsQueue, m_jscConfig, m_nativeExtensionsProvider);
+      delegate, jsQueue, m_jscConfig);
 }
 
 JSCExecutor::JSCExecutor(
     std::shared_ptr<ExecutorDelegate> delegate,
     std::shared_ptr<MessageQueueThread> messageQueueThread,
-    const folly::dynamic& jscConfig,
-    NativeExtensionsProvider nativeExtensionsProvider) throw(JSException)
+    const folly::dynamic& jscConfig) throw(JSException)
     : m_delegate(delegate),
       m_messageQueueThread(messageQueueThread),
       m_nativeModules(delegate ? delegate->getModuleRegistry() : nullptr),
-      m_jscConfig(jscConfig),
-      m_nativeExtensionsProvider(nativeExtensionsProvider) {
+      m_jscConfig(jscConfig) {
   initOnJSVMThread();
 
   {
@@ -142,12 +140,6 @@ JSCExecutor::JSCExecutor(
         "nativeModuleProxy",
         exceptionWrapMethod<&JSCExecutor::getNativeModule>());
   }
-  if (nativeExtensionsProvider) {
-    installGlobalProxy(
-        m_context,
-        "nativeExtensions",
-        exceptionWrapMethod<&JSCExecutor::getNativeExtension>());
-  }
 }
 
 JSCExecutor::~JSCExecutor() {
@@ -732,17 +724,6 @@ JSValueRef JSCExecutor::getNativeModule(
   return m_nativeModules.getModule(m_context, propertyName);
 }
 
-JSValueRef JSCExecutor::getNativeExtension(
-    JSObjectRef object,
-    JSStringRef propertyName) {
-  if (m_nativeExtensionsProvider) {
-    folly::dynamic value =
-        m_nativeExtensionsProvider(String::ref(m_context, propertyName).str());
-    return Value::fromDynamic(m_context, std::move(value));
-  }
-  return JSC_JSValueMakeUndefined(m_context);
-}
-
 JSValueRef JSCExecutor::nativeRequire(
     size_t count,
     const JSValueRef arguments[]) {
diff --git a/ReactCommon/cxxreact/JSCExecutor.h b/ReactCommon/cxxreact/JSCExecutor.h
index b85e590d7..151ded934 100644
--- a/ReactCommon/cxxreact/JSCExecutor.h
+++ b/ReactCommon/cxxreact/JSCExecutor.h
@@ -27,15 +27,14 @@ class RAMBundleRegistry;
 
 class RN_EXPORT JSCExecutorFactory : public JSExecutorFactory {
 public:
-  JSCExecutorFactory(const folly::dynamic& jscConfig, NativeExtensionsProvider provider) :
-    m_jscConfig(jscConfig), m_nativeExtensionsProvider(provider) {}
+  JSCExecutorFactory(const folly::dynamic& jscConfig) :
+    m_jscConfig(jscConfig) {}
   std::unique_ptr<JSExecutor> createJSExecutor(
     std::shared_ptr<ExecutorDelegate> delegate,
     std::shared_ptr<MessageQueueThread> jsQueue) override;
 private:
   std::string m_cacheDir;
   folly::dynamic m_jscConfig;
-  NativeExtensionsProvider m_nativeExtensionsProvider;
 };
 
 template<typename T>
@@ -59,8 +58,7 @@ public:
    */
   explicit JSCExecutor(std::shared_ptr<ExecutorDelegate> delegate,
                        std::shared_ptr<MessageQueueThread> messageQueueThread,
-                       const folly::dynamic& jscConfig,
-                       NativeExtensionsProvider nativeExtensionsProvider) throw(JSException);
+                       const folly::dynamic& jscConfig) throw(JSException);
   ~JSCExecutor() override;
 
   virtual void loadApplicationScript(
@@ -104,7 +102,6 @@ private:
   JSCNativeModules m_nativeModules;
   folly::dynamic m_jscConfig;
   std::once_flag m_bindFlag;
-  NativeExtensionsProvider m_nativeExtensionsProvider;
 
   folly::Optional<Object> m_invokeCallbackAndReturnFlushedQueueJS;
   folly::Optional<Object> m_callFunctionReturnFlushedQueueJS;
@@ -126,7 +123,6 @@ private:
   void installNativeHook(const char* name);
 
   JSValueRef getNativeModule(JSObjectRef object, JSStringRef propertyName);
-  JSValueRef getNativeExtension(JSObjectRef object, JSStringRef propertyName);
 
   JSValueRef nativeRequire(
       size_t argumentCount,