diff --git a/browser/base/content/spotlight.js b/browser/base/content/spotlight.js
index b07d54a71405..48d2968bfc91 100644
--- a/browser/base/content/spotlight.js
+++ b/browser/base/content/spotlight.js
@@ -5,8 +5,8 @@
 const browser = window.docShell.chromeEventHandler;
 const { document: gDoc, XPCOMUtils } = browser.ownerGlobal;
 
-XPCOMUtils.defineLazyModuleGetters(this, {
-  AboutWelcomeParent: "resource:///actors/AboutWelcomeParent.jsm",
+ChromeUtils.defineESModuleGetters(this, {
+  AboutWelcomeParent: "resource:///actors/AboutWelcomeParent.sys.mjs",
 });
 
 const CONFIG = window.arguments[0];
diff --git a/browser/components/BrowserGlue.sys.mjs b/browser/components/BrowserGlue.sys.mjs
index 1d34fcc86e3c..98c88da28982 100644
--- a/browser/components/BrowserGlue.sys.mjs
+++ b/browser/components/BrowserGlue.sys.mjs
@@ -386,10 +386,10 @@ let JSWINDOWACTORS = {
 
   AboutWelcomeShopping: {
     parent: {
-      moduleURI: "resource:///actors/AboutWelcomeParent.jsm",
+      esModuleURI: "resource:///actors/AboutWelcomeParent.sys.mjs",
     },
     child: {
-      moduleURI: "resource:///actors/AboutWelcomeChild.jsm",
+      esModuleURI: "resource:///actors/AboutWelcomeChild.sys.mjs",
       events: {
         Update: {},
       },
@@ -400,10 +400,10 @@ let JSWINDOWACTORS = {
 
   AboutWelcome: {
     parent: {
-      moduleURI: "resource:///actors/AboutWelcomeParent.jsm",
+      esModuleURI: "resource:///actors/AboutWelcomeParent.sys.mjs",
     },
     child: {
-      moduleURI: "resource:///actors/AboutWelcomeChild.jsm",
+      esModuleURI: "resource:///actors/AboutWelcomeChild.sys.mjs",
       events: {
         // This is added so the actor instantiates immediately and makes
         // methods available to the page js on load.
diff --git a/browser/components/firefoxview/tests/browser/head.js b/browser/components/firefoxview/tests/browser/head.js
index 3b0bc8447eca..4f6e0424e611 100644
--- a/browser/components/firefoxview/tests/browser/head.js
+++ b/browser/components/firefoxview/tests/browser/head.js
@@ -37,15 +37,12 @@ const { SessionStoreTestUtils } = ChromeUtils.importESModule(
 SessionStoreTestUtils.init(this, window);
 
 ChromeUtils.defineESModuleGetters(this, {
+  AboutWelcomeParent: "resource:///actors/AboutWelcomeParent.sys.mjs",
   BrowserWindowTracker: "resource:///modules/BrowserWindowTracker.sys.mjs",
   SyncedTabs: "resource://services-sync/SyncedTabs.sys.mjs",
   TabStateFlusher: "resource:///modules/sessionstore/TabStateFlusher.sys.mjs",
 });
 
-XPCOMUtils.defineLazyModuleGetters(this, {
-  AboutWelcomeParent: "resource:///actors/AboutWelcomeParent.jsm",
-});
-
 const MOBILE_PROMO_DISMISSED_PREF =
   "browser.tabs.firefox-view.mobilePromo.dismissed";
 const RECENTLY_CLOSED_STATE_PREF =
diff --git a/browser/components/newtab/aboutwelcome/AboutWelcomeChild.jsm b/browser/components/newtab/aboutwelcome/AboutWelcomeChild.sys.mjs
similarity index 98%
rename from browser/components/newtab/aboutwelcome/AboutWelcomeChild.jsm
rename to browser/components/newtab/aboutwelcome/AboutWelcomeChild.sys.mjs
index ddee2d4f9947..bb15da89c22d 100644
--- a/browser/components/newtab/aboutwelcome/AboutWelcomeChild.jsm
+++ b/browser/components/newtab/aboutwelcome/AboutWelcomeChild.sys.mjs
@@ -2,13 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-"use strict";
-
-const EXPORTED_SYMBOLS = ["AboutWelcomeChild", "AboutWelcomeShoppingChild"];
-
-const { XPCOMUtils } = ChromeUtils.importESModule(
-  "resource://gre/modules/XPCOMUtils.sys.mjs"
-);
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 
 const lazy = {};
 
@@ -29,7 +23,7 @@ XPCOMUtils.defineLazyGetter(lazy, "log", () => {
   return new Logger("AboutWelcomeChild");
 });
 
-class AboutWelcomeChild extends JSWindowActorChild {
+export class AboutWelcomeChild extends JSWindowActorChild {
   // Can be used to avoid accesses to the document/contentWindow after it's
   // destroyed, which may throw unhandled exceptions.
   _destroyed = false;
@@ -664,7 +658,7 @@ const MIN_VISITS_TO_SHOW_SURVEY = 5;
 // Wait 24 hours after opt in to show survey
 const MIN_TIME_AFTER_OPT_IN = 24 * 60 * 60;
 
-class AboutWelcomeShoppingChild extends AboutWelcomeChild {
+export class AboutWelcomeShoppingChild extends AboutWelcomeChild {
   // Static state used to track session in which user opted-in
   static optedInSession = false;
 
diff --git a/browser/components/newtab/aboutwelcome/AboutWelcomeParent.jsm b/browser/components/newtab/aboutwelcome/AboutWelcomeParent.sys.mjs
similarity index 97%
rename from browser/components/newtab/aboutwelcome/AboutWelcomeParent.jsm
rename to browser/components/newtab/aboutwelcome/AboutWelcomeParent.sys.mjs
index 9be3267e383a..4d3e0b30c984 100644
--- a/browser/components/newtab/aboutwelcome/AboutWelcomeParent.jsm
+++ b/browser/components/newtab/aboutwelcome/AboutWelcomeParent.sys.mjs
@@ -2,13 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-"use strict";
-
-const EXPORTED_SYMBOLS = ["AboutWelcomeParent", "AboutWelcomeShoppingParent"];
-
-const { XPCOMUtils } = ChromeUtils.importESModule(
-  "resource://gre/modules/XPCOMUtils.sys.mjs"
-);
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 
 const lazy = {};
 
@@ -124,7 +118,7 @@ class AboutWelcomeObserver {
   }
 }
 
-class AboutWelcomeParent extends JSWindowActorParent {
+export class AboutWelcomeParent extends JSWindowActorParent {
   constructor() {
     super();
     this.startAboutWelcomeObserver();
@@ -280,7 +274,7 @@ class AboutWelcomeParent extends JSWindowActorParent {
   }
 }
 
-class AboutWelcomeShoppingParent extends AboutWelcomeParent {
+export class AboutWelcomeShoppingParent extends AboutWelcomeParent {
   /**
    * Handle messages from AboutWelcomeChild.jsm
    *
diff --git a/browser/components/newtab/moz.build b/browser/components/newtab/moz.build
index 08135a888a7c..0275b96e05cc 100644
--- a/browser/components/newtab/moz.build
+++ b/browser/components/newtab/moz.build
@@ -46,8 +46,8 @@ EXTRA_JS_MODULES += [
 ]
 
 FINAL_TARGET_FILES.actors += [
-    "aboutwelcome/AboutWelcomeChild.jsm",
-    "aboutwelcome/AboutWelcomeParent.jsm",
+    "aboutwelcome/AboutWelcomeChild.sys.mjs",
+    "aboutwelcome/AboutWelcomeParent.sys.mjs",
     "actors/ASRouterChild.sys.mjs",
     "actors/ASRouterParent.sys.mjs",
 ]
diff --git a/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_addonspicker.js b/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_addonspicker.js
index b13c536039f3..9c4b7b36cdd3 100644
--- a/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_addonspicker.js
+++ b/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_addonspicker.js
@@ -1,7 +1,7 @@
 "use strict";
 
-const { AboutWelcomeParent } = ChromeUtils.import(
-  "resource:///actors/AboutWelcomeParent.jsm"
+const { AboutWelcomeParent } = ChromeUtils.importESModule(
+  "resource:///actors/AboutWelcomeParent.sys.mjs"
 );
 
 const { AboutWelcomeTelemetry } = ChromeUtils.import(
diff --git a/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_mr.js b/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_mr.js
index 95dd5025faa8..5b7d0a40c711 100644
--- a/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_mr.js
+++ b/browser/components/newtab/test/browser/browser_aboutwelcome_multistage_mr.js
@@ -1,7 +1,7 @@
 "use strict";
 
-const { AboutWelcomeParent } = ChromeUtils.import(
-  "resource:///actors/AboutWelcomeParent.jsm"
+const { AboutWelcomeParent } = ChromeUtils.importESModule(
+  "resource:///actors/AboutWelcomeParent.sys.mjs"
 );
 
 const { AboutWelcomeTelemetry } = ChromeUtils.import(
diff --git a/browser/components/newtab/test/browser/browser_aboutwelcome_observer.js b/browser/components/newtab/test/browser/browser_aboutwelcome_observer.js
index 1f7dc7412f2e..58f9059532a3 100644
--- a/browser/components/newtab/test/browser/browser_aboutwelcome_observer.js
+++ b/browser/components/newtab/test/browser/browser_aboutwelcome_observer.js
@@ -1,7 +1,7 @@
 "use strict";
 
-const { AboutWelcomeParent } = ChromeUtils.import(
-  "resource:///actors/AboutWelcomeParent.jsm"
+const { AboutWelcomeParent } = ChromeUtils.importESModule(
+  "resource:///actors/AboutWelcomeParent.sys.mjs"
 );
 
 async function openAboutWelcomeTab() {
diff --git a/browser/modules/FeatureCallout.sys.mjs b/browser/modules/FeatureCallout.sys.mjs
index c404805b23e1..29021b0c2abb 100644
--- a/browser/modules/FeatureCallout.sys.mjs
+++ b/browser/modules/FeatureCallout.sys.mjs
@@ -7,12 +7,12 @@ import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 const lazy = {};
 
 ChromeUtils.defineESModuleGetters(lazy, {
+  AboutWelcomeParent: "resource:///actors/AboutWelcomeParent.sys.mjs",
   CustomizableUI: "resource:///modules/CustomizableUI.sys.mjs",
   PageEventManager: "resource://activity-stream/lib/PageEventManager.sys.mjs",
 });
 
 XPCOMUtils.defineLazyModuleGetters(lazy, {
-  AboutWelcomeParent: "resource:///actors/AboutWelcomeParent.jsm",
   ASRouter: "resource://activity-stream/lib/ASRouter.jsm",
 });