diff --git a/packages/react-devtools-extensions/src/background.js b/packages/react-devtools-extensions/src/background.js
index e8ff0f3f16202..85595d26010bf 100644
--- a/packages/react-devtools-extensions/src/background.js
+++ b/packages/react-devtools-extensions/src/background.js
@@ -1,19 +1,12 @@
-// @flow strict-local
+/* global chrome */
 
 'use strict';
 
-declare var chrome: any;
-
-const ports: {
-  [tab: string]: {|devtools: any, 'content-script': any|},
-} = {};
+const ports = {};
 
 const IS_FIREFOX = navigator.userAgent.indexOf('Firefox') >= 0;
 
-import {
-  EXTENSION_INSTALL_CHECK,
-  SHOW_DUPLICATE_EXTENSION_WARNING,
-} from './constants';
+import {EXTENSION_INSTALL_CHECK_MESSAGE} from './constants';
 
 chrome.runtime.onConnect.addListener(function(port) {
   let tab = null;
@@ -127,9 +120,8 @@ chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
 
 chrome.runtime.onMessageExternal.addListener(
   (request, sender, sendResponse) => {
-    if (request === EXTENSION_INSTALL_CHECK) {
+    if (request === EXTENSION_INSTALL_CHECK_MESSAGE) {
       sendResponse(true);
-      chrome.runtime.sendMessage(SHOW_DUPLICATE_EXTENSION_WARNING);
     }
   },
 );
diff --git a/packages/react-devtools-extensions/src/checkForDuplicateInstallations.js b/packages/react-devtools-extensions/src/checkForDuplicateInstallations.js
index 1ebafe50b8835..e54476283cc61 100644
--- a/packages/react-devtools-extensions/src/checkForDuplicateInstallations.js
+++ b/packages/react-devtools-extensions/src/checkForDuplicateInstallations.js
@@ -11,13 +11,13 @@ declare var chrome: any;
 
 import {__DEBUG__} from 'react-devtools-shared/src/constants';
 import {
-  EXTENSION_INSTALL_CHECK,
+  EXTENSION_INSTALL_CHECK_MESSAGE,
   EXTENSION_INSTALLATION_TYPE,
   INTERNAL_EXTENSION_ID,
   LOCAL_EXTENSION_ID,
 } from './constants';
 
-const UNRECOGNIZED_EXTENSION_ERROR =
+const UNRECOGNIZED_EXTENSION_WARNING =
   'React Developer Tools: You are running an unrecognized installation of the React Developer Tools extension, which might conflict with other versions of the extension installed in your browser. ' +
   'Please make sure you only have a single version of the extension installed or enabled. ' +
   'If you are developing this extension locally, make sure to build the extension using the `yarn build:<browser>:local` command.';
@@ -68,9 +68,9 @@ export function checkForDuplicateInstallations(callback: boolean => void) {
       // detect if there are other installations of DevTools present.
       // In this case, assume there are no duplicate exensions and show a warning about
       // potential conflicts.
-      console.error(UNRECOGNIZED_EXTENSION_ERROR);
+      console.error(UNRECOGNIZED_EXTENSION_WARNING);
       chrome.devtools.inspectedWindow.eval(
-        `console.error("${UNRECOGNIZED_EXTENSION_ERROR}")`,
+        `console.error("${UNRECOGNIZED_EXTENSION_WARNING}")`,
       );
       callback(false);
       break;
@@ -80,9 +80,9 @@ export function checkForDuplicateInstallations(callback: boolean => void) {
       // are other installations of DevTools present.
       // In this case, assume there are no duplicate exensions and show a warning about
       // potential conflicts.
-      console.error(UNRECOGNIZED_EXTENSION_ERROR);
+      console.error(UNRECOGNIZED_EXTENSION_WARNING);
       chrome.devtools.inspectedWindow.eval(
-        `console.error("${UNRECOGNIZED_EXTENSION_ERROR}")`,
+        `console.error("${UNRECOGNIZED_EXTENSION_WARNING}")`,
       );
       callback(false);
       break;
@@ -105,7 +105,7 @@ function checkForInstalledExtension(extensionId: string): Promise<boolean> {
   return new Promise(resolve => {
     chrome.runtime.sendMessage(
       extensionId,
-      EXTENSION_INSTALL_CHECK,
+      EXTENSION_INSTALL_CHECK_MESSAGE,
       response => {
         if (__DEBUG__) {
           console.log(
diff --git a/packages/react-devtools-extensions/src/constants.js b/packages/react-devtools-extensions/src/constants.js
index 310bbaca11563..5e85e4aec40e7 100644
--- a/packages/react-devtools-extensions/src/constants.js
+++ b/packages/react-devtools-extensions/src/constants.js
@@ -11,9 +11,7 @@ declare var chrome: any;
 
 export const CURRENT_EXTENSION_ID = chrome.runtime.id;
 
-export const EXTENSION_INSTALL_CHECK = 'extension-install-check';
-export const SHOW_DUPLICATE_EXTENSION_WARNING =
-  'show-duplicate-extension-warning';
+export const EXTENSION_INSTALL_CHECK_MESSAGE = 'extension-install-check';
 
 export const CHROME_WEBSTORE_EXTENSION_ID = 'fmkadmapgofadopljbjfkapdkoienihi';
 export const INTERNAL_EXTENSION_ID = 'dnjnjgbfilfphmojnmhliehogmojhclc';
diff --git a/packages/react-devtools-extensions/src/main.js b/packages/react-devtools-extensions/src/main.js
index 5203b511035d5..8280158e1db70 100644
--- a/packages/react-devtools-extensions/src/main.js
+++ b/packages/react-devtools-extensions/src/main.js
@@ -22,11 +22,7 @@ import {
 import DevTools from 'react-devtools-shared/src/devtools/views/DevTools';
 import {__DEBUG__} from 'react-devtools-shared/src/constants';
 import {logEvent} from 'react-devtools-shared/src/Logger';
-import {
-  CURRENT_EXTENSION_ID,
-  EXTENSION_INSTALLATION_TYPE,
-  SHOW_DUPLICATE_EXTENSION_WARNING,
-} from './constants';
+import {CURRENT_EXTENSION_ID, EXTENSION_INSTALLATION_TYPE} from './constants';
 import {checkForDuplicateInstallations} from './checkForDuplicateInstallations';
 
 const LOCAL_STORAGE_SUPPORTS_PROFILING_KEY =
@@ -112,39 +108,11 @@ function createPanelIfReactLoaded() {
         let mostRecentOverrideTab = null;
         let render = null;
         let root = null;
-        let warnIfDuplicateInstallation = false;
 
         const tabId = chrome.devtools.inspectedWindow.tabId;
 
         registerDevToolsEventLogger('extension');
 
-        function onDuplicateExtensionMessage(message) {
-          if (message === SHOW_DUPLICATE_EXTENSION_WARNING) {
-            chrome.runtime.onMessage.removeListener(
-              onDuplicateExtensionMessage,
-            );
-
-            if (warnIfDuplicateInstallation === true) {
-              return;
-            }
-            warnIfDuplicateInstallation = true;
-            const errorMessage =
-              'React Developer Tools: We detected that there are multiple versions of React Developer Tools ' +
-              'installed and enabled in your browser at the same time, which will cause ' +
-              'issues while using the extension. ' +
-              'Please ensure that you have installed and enabled only a single ' +
-              'version of React Developer Tools before proceeding.';
-            console.error(errorMessage);
-            chrome.devtools.inspectedWindow.eval(
-              `console.error("${errorMessage}")`,
-            );
-            if (render != null) {
-              render();
-            }
-          }
-        }
-        chrome.runtime.onMessage.addListener(onDuplicateExtensionMessage);
-
         function initBridgeAndStore() {
           const port = chrome.runtime.connect({
             name: String(tabId),
@@ -406,7 +374,6 @@ function createPanelIfReactLoaded() {
                 hookNamesModuleLoaderFunction,
                 overrideTab,
                 profilerPortalContainer,
-                warnIfDuplicateInstallation,
                 showTabBar: false,
                 store,
                 warnIfUnsupportedVersionDetected: true,
diff --git a/packages/react-devtools-shared/src/devtools/views/DevTools.js b/packages/react-devtools-shared/src/devtools/views/DevTools.js
index 8f1b6a22c11bc..781ad9d902f68 100644
--- a/packages/react-devtools-shared/src/devtools/views/DevTools.js
+++ b/packages/react-devtools-shared/src/devtools/views/DevTools.js
@@ -34,7 +34,6 @@ import {SchedulingProfilerContextController} from 'react-devtools-scheduling-pro
 import {ModalDialogContextController} from './ModalDialog';
 import ReactLogo from './ReactLogo';
 import UnsupportedBridgeProtocolDialog from './UnsupportedBridgeProtocolDialog';
-import DuplicateInstallationDialog from './DuplicateInstallationDialog';
 import UnsupportedVersionDialog from './UnsupportedVersionDialog';
 import WarnIfLegacyBackendDetected from './WarnIfLegacyBackendDetected';
 import {useLocalStorage} from './hooks';
@@ -74,7 +73,6 @@ export type Props = {|
   enabledInspectedElementContextMenu?: boolean,
   showTabBar?: boolean,
   store: Store,
-  warnIfDuplicateInstallation?: boolean,
   warnIfLegacyBackendDetected?: boolean,
   warnIfUnsupportedVersionDetected?: boolean,
   viewAttributeSourceFunction?: ?ViewAttributeSource,
@@ -134,7 +132,6 @@ export default function DevTools({
   profilerPortalContainer,
   showTabBar = false,
   store,
-  warnIfDuplicateInstallation = false,
   warnIfLegacyBackendDetected = false,
   warnIfUnsupportedVersionDetected = false,
   viewAttributeSourceFunction,
@@ -322,7 +319,6 @@ export default function DevTools({
                 </ViewElementSourceContext.Provider>
               </SettingsContextController>
               <UnsupportedBridgeProtocolDialog />
-              {warnIfDuplicateInstallation && <DuplicateInstallationDialog />}
               {warnIfLegacyBackendDetected && <WarnIfLegacyBackendDetected />}
               {warnIfUnsupportedVersionDetected && <UnsupportedVersionDialog />}
             </ModalDialogContextController>
diff --git a/packages/react-devtools-shared/src/devtools/views/DuplicateInstallationDialog.js b/packages/react-devtools-shared/src/devtools/views/DuplicateInstallationDialog.js
deleted file mode 100644
index 12a32ce4b7f43..0000000000000
--- a/packages/react-devtools-shared/src/devtools/views/DuplicateInstallationDialog.js
+++ /dev/null
@@ -1,55 +0,0 @@
-/**
- * Copyright (c) Facebook, Inc. and its affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow strict-local
- */
-
-import * as React from 'react';
-import {Fragment, useContext, useEffect} from 'react';
-import {isInternalFacebookBuild} from 'react-devtools-feature-flags';
-import {ModalDialogContext} from './ModalDialog';
-
-export default function DuplicateInstallationDialog(_: {||}) {
-  const {dispatch} = useContext(ModalDialogContext);
-
-  useEffect(() => {
-    dispatch({
-      canBeDismissed: false,
-      id: 'DuplicateInstallationDialog',
-      type: 'SHOW',
-      title: 'Duplicate Installations of DevTools Detected',
-      content: <DialogContent />,
-    });
-  }, []);
-  return null;
-}
-
-function DialogContent(_: {||}) {
-  return (
-    <Fragment>
-      <p>
-        We detected that there are multiple versions of React Developer Tools
-        installed and enabled in your browser at the same time, which will cause
-        issues while using the extension.
-      </p>
-      {isInternalFacebookBuild ? (
-        <p>
-          Before proceeding, please ensure that the only enabled version of
-          React Developer Tools is the internal (Chef-installed) version. To
-          manage your extensions, visit the <code>about://extensions</code> page
-          in your browser.
-        </p>
-      ) : (
-        <p>
-          Please ensure that you have installed and enabled only a single
-          version of React Developer Tools before proceeding. To manage your
-          extensions, visit the <code>about://extensions</code> page in your
-          browser.
-        </p>
-      )}
-    </Fragment>
-  );
-}