diff --git a/packages/shared/forks/ReactFeatureFlags.testing.js b/packages/shared/forks/ReactFeatureFlags.testing.js
deleted file mode 100644
index ee17c5053ef86..0000000000000
--- a/packages/shared/forks/ReactFeatureFlags.testing.js
+++ /dev/null
@@ -1,78 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow
- */
-
-import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
-import typeof * as ExportsType from './ReactFeatureFlags.testing';
-
-export const debugRenderPhaseSideEffectsForStrictMode = false;
-export const enableDebugTracing = false;
-export const enableSchedulingProfiler = __PROFILE__;
-export const replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
-export const enableProfilerTimer = __PROFILE__;
-export const enableProfilerCommitHooks = __PROFILE__;
-export const enableProfilerNestedUpdatePhase = __PROFILE__;
-export const enableProfilerNestedUpdateScheduledHook = false;
-export const enableUpdaterTracking = false;
-export const enableCache = __EXPERIMENTAL__;
-export const enableLegacyCache = __EXPERIMENTAL__;
-export const enableCacheElement = __EXPERIMENTAL__;
-export const enableFetchInstrumentation = __EXPERIMENTAL__;
-export const disableJavaScriptURLs = false;
-export const disableCommentsAsDOMContainers = true;
-export const disableInputAttributeSyncing = false;
-export const enableSchedulerDebugging = false;
-export const enableScopeAPI = false;
-export const enableCreateEventHandleAPI = false;
-export const enableSuspenseCallback = false;
-export const disableLegacyContext = false;
-export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
-export const enableTrustedTypesIntegration = false;
-export const disableTextareaChildren = false;
-export const disableModulePatternComponents = false;
-export const enableSuspenseAvoidThisFallback = false;
-export const enableSuspenseAvoidThisFallbackFizz = false;
-export const enableCPUSuspense = false;
-export const enableUseHook = true;
-export const enableUseMemoCacheHook = false;
-export const enableUseEffectEventHook = false;
-export const enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay =
-  true;
-export const enableClientRenderFallbackOnTextMismatch = true;
-export const enableComponentStackLocations = true;
-export const enableLegacyFBSupport = false;
-export const enableFilterEmptyStringAttributesDOM = false;
-export const disableNativeComponentFrames = false;
-export const skipUnmountedBoundaries = false;
-export const enableGetInspectorDataForInstanceInProduction = false;
-export const deferRenderPhaseUpdateToNextBatch = false;
-
-export const createRootStrictEffectsByDefault = false;
-export const enableUseRefAccessWarning = false;
-
-export const disableSchedulerTimeoutInWorkLoop = false;
-export const enableLazyContextPropagation = false;
-export const enableLegacyHidden = false;
-export const enableUnifiedSyncLane = __EXPERIMENTAL__;
-export const allowConcurrentByDefault = false;
-export const enableCustomElementPropertySupport = false;
-
-export const consoleManagedByDevToolsDuringStrictMode = false;
-export const enableServerContext = true;
-export const enableUseMutableSource = false;
-
-export const enableTransitionTracing = false;
-
-export const enableFloat = true;
-export const enableHostSingletons = true;
-
-export const useModernStrictMode = false;
-export const enableFizzExternalRuntime = false;
-
-// Flow magic to verify the exports of this file match the original version.
-((((null: any): ExportsType): FeatureFlagsType): ExportsType);
diff --git a/packages/shared/forks/ReactFeatureFlags.testing.www.js b/packages/shared/forks/ReactFeatureFlags.testing.www.js
deleted file mode 100644
index 9cbb2929c1a81..0000000000000
--- a/packages/shared/forks/ReactFeatureFlags.testing.www.js
+++ /dev/null
@@ -1,79 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow
- */
-
-import typeof * as FeatureFlagsType from 'shared/ReactFeatureFlags';
-import typeof * as ExportsType from './ReactFeatureFlags.testing.www';
-
-export const debugRenderPhaseSideEffectsForStrictMode = false;
-export const enableDebugTracing = false;
-export const enableSchedulingProfiler = false;
-export const replayFailedUnitOfWorkWithInvokeGuardedCallback = false;
-export const enableProfilerTimer = false;
-export const enableProfilerCommitHooks = false;
-export const enableProfilerNestedUpdatePhase = false;
-export const enableProfilerNestedUpdateScheduledHook = false;
-export const enableUpdaterTracking = false;
-export const enableCache = true;
-export const enableLegacyCache = true;
-export const enableCacheElement = true;
-export const enableFetchInstrumentation = false;
-export const disableJavaScriptURLs = true;
-export const disableCommentsAsDOMContainers = true;
-export const disableInputAttributeSyncing = false;
-export const enableSchedulerDebugging = false;
-export const enableScopeAPI = true;
-export const enableCreateEventHandleAPI = true;
-export const enableSuspenseCallback = true;
-export const disableLegacyContext = __EXPERIMENTAL__;
-export const disableSchedulerTimeoutBasedOnReactExpirationTime = false;
-export const enableTrustedTypesIntegration = false;
-export const disableTextareaChildren = __EXPERIMENTAL__;
-export const disableModulePatternComponents = true;
-export const enableSuspenseAvoidThisFallback = true;
-export const enableSuspenseAvoidThisFallbackFizz = false;
-export const enableCPUSuspense = true;
-export const enableUseHook = true;
-export const enableUseMemoCacheHook = false;
-export const enableUseEffectEventHook = false;
-export const enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay =
-  true;
-export const enableClientRenderFallbackOnTextMismatch = true;
-export const enableComponentStackLocations = true;
-export const enableLegacyFBSupport = !__EXPERIMENTAL__;
-export const enableFilterEmptyStringAttributesDOM = false;
-export const disableNativeComponentFrames = false;
-export const skipUnmountedBoundaries = true;
-export const enableGetInspectorDataForInstanceInProduction = false;
-export const deferRenderPhaseUpdateToNextBatch = false;
-
-export const createRootStrictEffectsByDefault = false;
-export const enableUseRefAccessWarning = false;
-
-export const disableSchedulerTimeoutInWorkLoop = false;
-export const enableLazyContextPropagation = false;
-export const enableLegacyHidden = false;
-export const enableUnifiedSyncLane = __EXPERIMENTAL__;
-export const allowConcurrentByDefault = true;
-export const enableCustomElementPropertySupport = false;
-
-export const consoleManagedByDevToolsDuringStrictMode = false;
-export const enableServerContext = true;
-// Some www surfaces are still using this. Remove once they have been migrated.
-export const enableUseMutableSource = true;
-
-export const enableTransitionTracing = false;
-
-export const enableFloat = true;
-export const enableHostSingletons = true;
-
-export const useModernStrictMode = false;
-export const enableFizzExternalRuntime = false;
-
-// Flow magic to verify the exports of this file match the original version.
-((((null: any): ExportsType): FeatureFlagsType): ExportsType);
diff --git a/scripts/rollup/forks.js b/scripts/rollup/forks.js
index 93833be1467b4..21217ec50a377 100644
--- a/scripts/rollup/forks.js
+++ b/scripts/rollup/forks.js
@@ -135,14 +135,6 @@ const forks = Object.freeze({
             return './packages/shared/forks/ReactFeatureFlags.test-renderer.www.js';
         }
         return './packages/shared/forks/ReactFeatureFlags.test-renderer.js';
-      case 'react-dom/unstable_testing':
-        switch (bundleType) {
-          case FB_WWW_DEV:
-          case FB_WWW_PROD:
-          case FB_WWW_PROFILING:
-            return './packages/shared/forks/ReactFeatureFlags.testing.www.js';
-        }
-        return './packages/shared/forks/ReactFeatureFlags.testing.js';
       default:
         switch (bundleType) {
           case FB_WWW_DEV: