diff --git a/mail/components/im/IMIncomingServer.jsm b/mail/components/im/IMIncomingServer.sys.mjs
similarity index 98%
rename from mail/components/im/IMIncomingServer.jsm
rename to mail/components/im/IMIncomingServer.sys.mjs
index 602ed24a9c..aea800cec7 100644
--- a/mail/components/im/IMIncomingServer.jsm
+++ b/mail/components/im/IMIncomingServer.sys.mjs
@@ -2,13 +2,9 @@
  * 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/. */
 
-var EXPORTED_SYMBOLS = ["IMIncomingServer"];
+import { IMServices } from "resource:///modules/IMServices.sys.mjs";
 
-var { IMServices } = ChromeUtils.importESModule(
-  "resource:///modules/IMServices.sys.mjs"
-);
-
-function IMIncomingServer() {}
+export function IMIncomingServer() {}
 
 IMIncomingServer.prototype = {
   get wrappedJSObject() {
diff --git a/mail/components/im/IMProtocolInfo.jsm b/mail/components/im/IMProtocolInfo.sys.mjs
similarity index 94%
rename from mail/components/im/IMProtocolInfo.jsm
rename to mail/components/im/IMProtocolInfo.sys.mjs
index 31ca76197b..975a3a4a0a 100644
--- a/mail/components/im/IMProtocolInfo.jsm
+++ b/mail/components/im/IMProtocolInfo.sys.mjs
@@ -2,9 +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/. */
 
-var EXPORTED_SYMBOLS = ["IMProtocolInfo"];
-
-function IMProtocolInfo() {}
+export function IMProtocolInfo() {}
 
 IMProtocolInfo.prototype = {
   defaultLocalPath: null,
diff --git a/mail/components/im/components.conf b/mail/components/im/components.conf
index c3153690f7..2d379db965 100644
--- a/mail/components/im/components.conf
+++ b/mail/components/im/components.conf
@@ -8,13 +8,13 @@ Classes = [
   {
     'cid': '{13118758-dad2-418c-a03d-1acbfed0cd01}',
     'contract_ids': ['@mozilla.org/messenger/protocol/info;1?type=im'],
-    'jsm': 'resource:///modules/IMProtocolInfo.jsm',
+    'esModule': 'resource:///modules/IMProtocolInfo.sys.mjs',
     'constructor': 'IMProtocolInfo',
   },
   {
     'cid': '{9dd7f36b-5960-4f0a-8789-f5f516bd083d}',
     'contract_ids': ['@mozilla.org/messenger/server;1?type=im'],
-    'jsm': 'resource:///modules/IMIncomingServer.jsm',
+    'esModule': 'resource:///modules/IMIncomingServer.sys.mjs',
     'constructor': 'IMIncomingServer',
   },
 ]
diff --git a/mail/components/im/content/addbuddy.js b/mail/components/im/content/addbuddy.js
index 3671cb662c..b3d31b523a 100644
--- a/mail/components/im/content/addbuddy.js
+++ b/mail/components/im/content/addbuddy.js
@@ -5,7 +5,9 @@
 var { IMServices } = ChromeUtils.importESModule(
   "resource:///modules/IMServices.sys.mjs"
 );
-var { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+var { ChatIcons } = ChromeUtils.importESModule(
+  "resource:///modules/chatIcons.sys.mjs"
+);
 
 var addBuddy = {
   onload() {
diff --git a/mail/components/im/content/am-im.js b/mail/components/im/content/am-im.js
index de5c8a9794..20b653e5e2 100644
--- a/mail/components/im/content/am-im.js
+++ b/mail/components/im/content/am-im.js
@@ -5,16 +5,14 @@
 // chat/content/imAccountOptionsHelper.js
 /* globals accountOptionsHelper */
 
+const { ChatIcons } = ChromeUtils.importESModule(
+  "resource:///modules/chatIcons.sys.mjs"
+);
 ChromeUtils.defineESModuleGetters(this, {
+  ChatEncryption: "resource:///modules/ChatEncryption.sys.mjs",
   OTR: "resource:///modules/OTR.sys.mjs",
   OTRUI: "resource:///modules/OTRUI.sys.mjs",
 });
-const { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
-ChromeUtils.defineModuleGetter(
-  this,
-  "ChatEncryption",
-  "resource:///modules/ChatEncryption.jsm"
-);
 
 var autoJoinPref = "autoJoin";
 
diff --git a/mail/components/im/content/chat-contact.js b/mail/components/im/content/chat-contact.js
index 8f7ed4ffb4..f9e38cc5ed 100644
--- a/mail/components/im/content/chat-contact.js
+++ b/mail/components/im/content/chat-contact.js
@@ -11,7 +11,9 @@
   const { IMServices } = ChromeUtils.importESModule(
     "resource:///modules/IMServices.sys.mjs"
   );
-  const { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+  const { ChatIcons } = ChromeUtils.importESModule(
+    "resource:///modules/chatIcons.sys.mjs"
+  );
 
   /**
    * The MozChatContactRichlistitem widget displays contact information about user under
diff --git a/mail/components/im/content/chat-conversation-info.js b/mail/components/im/content/chat-conversation-info.js
index 12a1fc1c02..69eada043e 100644
--- a/mail/components/im/content/chat-conversation-info.js
+++ b/mail/components/im/content/chat-conversation-info.js
@@ -8,7 +8,9 @@
 
 // Wrap in a block to prevent leaking to window scope.
 {
-  const { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+  const { ChatIcons } = ChromeUtils.importESModule(
+    "resource:///modules/chatIcons.sys.mjs"
+  );
 
   ChromeUtils.defineESModuleGetters(this, {
     OTR: "resource:///modules/OTR.sys.mjs",
diff --git a/mail/components/im/content/chat-conversation.js b/mail/components/im/content/chat-conversation.js
index 3c85dfa21d..0e755b49c5 100644
--- a/mail/components/im/content/chat-conversation.js
+++ b/mail/components/im/content/chat-conversation.js
@@ -40,11 +40,9 @@
     constructor() {
       super();
 
-      ChromeUtils.defineModuleGetter(
-        this,
-        "ChatEncryption",
-        "resource:///modules/ChatEncryption.jsm"
-      );
+      ChromeUtils.defineESModuleGetters(this, {
+        ChatEncryption: "resource:///modules/ChatEncryption.sys.mjs",
+      });
 
       this.observer = {
         // @see {nsIObserver}
diff --git a/mail/components/im/content/chat-imconv.js b/mail/components/im/content/chat-imconv.js
index 15207a30be..a7662faef6 100644
--- a/mail/components/im/content/chat-imconv.js
+++ b/mail/components/im/content/chat-imconv.js
@@ -14,7 +14,9 @@
   const { AppConstants } = ChromeUtils.import(
     "resource://gre/modules/AppConstants.jsm"
   );
-  const { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+  const { ChatIcons } = ChromeUtils.importESModule(
+    "resource:///modules/chatIcons.sys.mjs"
+  );
 
   /**
    * The MozChatConvRichlistitem widget displays opened conversation information from the
diff --git a/mail/components/im/content/chat-messenger.js b/mail/components/im/content/chat-messenger.js
index 3f9a863d46..c05305d11a 100644
--- a/mail/components/im/content/chat-messenger.js
+++ b/mail/components/im/content/chat-messenger.js
@@ -9,8 +9,8 @@
 /* globals MailToolboxCustomizeDone, openIMAccountMgr,
    PROTO_TREE_VIEW, Status, statusSelector, ZoomManager, gSpacesToolbar */
 
-var { Notifications } = ChromeUtils.import(
-  "resource:///modules/chatNotifications.jsm"
+var { Notifications } = ChromeUtils.importESModule(
+  "resource:///modules/chatNotifications.sys.mjs"
 );
 var { IMServices } = ChromeUtils.importESModule(
   "resource:///modules/IMServices.sys.mjs"
@@ -23,13 +23,9 @@ var { InlineSpellChecker } = ChromeUtils.importESModule(
 );
 
 ChromeUtils.defineESModuleGetters(this, {
+  ChatEncryption: "resource:///modules/ChatEncryption.sys.mjs",
   OTRUI: "resource:///modules/OTRUI.sys.mjs",
 });
-ChromeUtils.defineModuleGetter(
-  this,
-  "ChatEncryption",
-  "resource:///modules/ChatEncryption.jsm"
-);
 
 var gChatSpellChecker;
 var gRangeParent;
@@ -1859,9 +1855,11 @@ var chatHandler = {
     document.getElementById("conversationsGroup").sortComparator = (a, b) =>
       a.title.toLowerCase().localeCompare(b.title.toLowerCase());
 
-    const { allContacts, onlineContacts, ChatCore } = ChromeUtils.import(
-      "resource:///modules/chatHandler.jsm"
-    );
+    const {
+      allContacts,
+      onlineContacts,
+      ChatCore,
+    } = ChromeUtils.importESModule("resource:///modules/chatHandler.sys.mjs");
     this.allContacts = allContacts;
     this.onlineContacts = onlineContacts;
     this.ChatCore = ChatCore;
diff --git a/mail/components/im/content/imAccountWizard.js b/mail/components/im/content/imAccountWizard.js
index ec748b8ea3..7d5a2eab87 100644
--- a/mail/components/im/content/imAccountWizard.js
+++ b/mail/components/im/content/imAccountWizard.js
@@ -11,7 +11,9 @@ var { IMServices } = ChromeUtils.importESModule(
 var { MailServices } = ChromeUtils.import(
   "resource:///modules/MailServices.jsm"
 );
-var { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+var { ChatIcons } = ChromeUtils.importESModule(
+  "resource:///modules/chatIcons.sys.mjs"
+);
 
 var PREF_EXTENSIONS_GETMOREPROTOCOLSURL = "extensions.getMoreProtocolsURL";
 
diff --git a/mail/components/im/content/imStatusSelector.js b/mail/components/im/content/imStatusSelector.js
index beff2a61c8..69bbc2776a 100644
--- a/mail/components/im/content/imStatusSelector.js
+++ b/mail/components/im/content/imStatusSelector.js
@@ -8,7 +8,9 @@ var { Status } = ChromeUtils.importESModule(
 var { IMServices } = ChromeUtils.importESModule(
   "resource:///modules/IMServices.sys.mjs"
 );
-var { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+var { ChatIcons } = ChromeUtils.importESModule(
+  "resource:///modules/chatIcons.sys.mjs"
+);
 
 var statusSelector = {
   observe(aSubject, aTopic, aMsg) {
diff --git a/mail/components/im/content/joinchat.js b/mail/components/im/content/joinchat.js
index 696bb25215..ae4029eb5a 100644
--- a/mail/components/im/content/joinchat.js
+++ b/mail/components/im/content/joinchat.js
@@ -5,7 +5,9 @@
 var { IMServices } = ChromeUtils.importESModule(
   "resource:///modules/IMServices.sys.mjs"
 );
-var { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+var { ChatIcons } = ChromeUtils.importESModule(
+  "resource:///modules/chatIcons.sys.mjs"
+);
 
 var autoJoinPref = "autoJoin";
 
diff --git a/mail/components/im/modules/ChatEncryption.jsm b/mail/components/im/modules/ChatEncryption.sys.mjs
similarity index 98%
rename from mail/components/im/modules/ChatEncryption.jsm
rename to mail/components/im/modules/ChatEncryption.sys.mjs
index 2ce472d7f8..1b78d1f581 100644
--- a/mail/components/im/modules/ChatEncryption.jsm
+++ b/mail/components/im/modules/ChatEncryption.sys.mjs
@@ -2,8 +2,6 @@
  * 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/. */
 
-const EXPORTED_SYMBOLS = ["ChatEncryption"];
-
 const { XPCOMUtils } = ChromeUtils.import(
   "resource://gre/modules/XPCOMUtils.jsm"
 );
@@ -28,7 +26,7 @@ const STATE_STRING = {
   [Ci.prplIConversation.ENCRYPTION_TRUSTED]: "private",
 };
 
-const ChatEncryption = {
+export const ChatEncryption = {
   /**
    * If OTR is enabled.
    *
diff --git a/mail/components/im/modules/GlodaIMSearcher.jsm b/mail/components/im/modules/GlodaIMSearcher.sys.mjs
similarity index 99%
rename from mail/components/im/modules/GlodaIMSearcher.jsm
rename to mail/components/im/modules/GlodaIMSearcher.sys.mjs
index bdaebe3b66..f97519ddea 100644
--- a/mail/components/im/modules/GlodaIMSearcher.jsm
+++ b/mail/components/im/modules/GlodaIMSearcher.sys.mjs
@@ -2,8 +2,6 @@
  * 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/. */
 
-const EXPORTED_SYMBOLS = ["GlodaIMSearcher"];
-
 const { Gloda } = ChromeUtils.import(
   "resource:///modules/gloda/GlodaPublic.jsm"
 );
@@ -192,7 +190,7 @@ function scoreOffsets(aMessage, aContext) {
  *  mechanism to explicitly score the IM conversations given the search context in
  *  addition to the more generic score adjusting rules.
  */
-function GlodaIMSearcher(aListener, aSearchString, aAndTerms) {
+export function GlodaIMSearcher(aListener, aSearchString, aAndTerms) {
   this.listener = aListener;
 
   this.searchString = aSearchString;
@@ -204,6 +202,7 @@ function GlodaIMSearcher(aListener, aSearchString, aAndTerms) {
 
   this.scores = null;
 }
+
 GlodaIMSearcher.prototype = {
   /**
    * Number of messages to retrieve initially.
diff --git a/mail/components/im/modules/chatHandler.jsm b/mail/components/im/modules/chatHandler.sys.mjs
similarity index 93%
rename from mail/components/im/modules/chatHandler.jsm
rename to mail/components/im/modules/chatHandler.sys.mjs
index c462900821..939c34e27f 100644
--- a/mail/components/im/modules/chatHandler.jsm
+++ b/mail/components/im/modules/chatHandler.sys.mjs
@@ -2,19 +2,16 @@
  * 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/. */
 
-const EXPORTED_SYMBOLS = ["allContacts", "onlineContacts", "ChatCore"];
+import { IMServices } from "resource:///modules/IMServices.sys.mjs";
 
-const { IMServices } = ChromeUtils.importESModule(
-  "resource:///modules/IMServices.sys.mjs"
-);
 const { MailServices } = ChromeUtils.import(
   "resource:///modules/MailServices.jsm"
 );
 
-var allContacts = {};
-var onlineContacts = {};
+export var allContacts = {};
+export var onlineContacts = {};
 
-var ChatCore = {
+export var ChatCore = {
   initialized: false,
   _initializing: false,
   init() {
diff --git a/mail/components/im/modules/chatIcons.jsm b/mail/components/im/modules/chatIcons.sys.mjs
similarity index 98%
rename from mail/components/im/modules/chatIcons.jsm
rename to mail/components/im/modules/chatIcons.sys.mjs
index 60b36c3e54..d5e716a142 100644
--- a/mail/components/im/modules/chatIcons.jsm
+++ b/mail/components/im/modules/chatIcons.sys.mjs
@@ -2,9 +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/. */
 
-const EXPORTED_SYMBOLS = ["ChatIcons"];
-
-var ChatIcons = {
+export var ChatIcons = {
   /**
    * Get the icon URI for the given protocol.
    *
diff --git a/mail/components/im/modules/chatNotifications.jsm b/mail/components/im/modules/chatNotifications.sys.mjs
similarity index 97%
rename from mail/components/im/modules/chatNotifications.jsm
rename to mail/components/im/modules/chatNotifications.sys.mjs
index a61a3425a5..e699d447e8 100644
--- a/mail/components/im/modules/chatNotifications.jsm
+++ b/mail/components/im/modules/chatNotifications.sys.mjs
@@ -2,11 +2,8 @@
  * 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/. */
 
-const EXPORTED_SYMBOLS = ["Notifications"];
+import { IMServices } from "resource:///modules/IMServices.sys.mjs";
 
-const { IMServices } = ChromeUtils.importESModule(
-  "resource:///modules/IMServices.sys.mjs"
-);
 const { AppConstants } = ChromeUtils.import(
   "resource://gre/modules/AppConstants.jsm"
 );
@@ -16,13 +13,13 @@ const { PluralForm } = ChromeUtils.import(
 const { clearTimeout, setTimeout } = ChromeUtils.import(
   "resource://gre/modules/Timer.jsm"
 );
-const { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+import { ChatIcons } from "resource:///modules/chatIcons.sys.mjs";
 
 // Time in seconds: it is the minimum time of inactivity
 // needed to show the bundled notification.
 var kTimeToWaitForMoreMsgs = 3;
 
-var Notifications = {
+export var Notifications = {
   get ellipsis() {
     let ellipsis = "[\u2026]";
 
diff --git a/mail/components/im/modules/index_im.jsm b/mail/components/im/modules/index_im.sys.mjs
similarity index 99%
rename from mail/components/im/modules/index_im.jsm
rename to mail/components/im/modules/index_im.sys.mjs
index fe9d31d4cf..0be468fe9b 100644
--- a/mail/components/im/modules/index_im.jsm
+++ b/mail/components/im/modules/index_im.sys.mjs
@@ -2,8 +2,6 @@
  * 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/. */
 
-const EXPORTED_SYMBOLS = [];
-
 var CC = Components.Constructor;
 
 const { Gloda } = ChromeUtils.import(
@@ -18,15 +16,11 @@ const { GlodaConstants } = ChromeUtils.import(
 const { GlodaIndexer, IndexingJob } = ChromeUtils.import(
   "resource:///modules/gloda/GlodaIndexer.jsm"
 );
-const { IMServices } = ChromeUtils.importESModule(
-  "resource:///modules/IMServices.sys.mjs"
-);
+import { IMServices } from "resource:///modules/IMServices.sys.mjs";
 const { MailServices } = ChromeUtils.import(
   "resource:///modules/MailServices.jsm"
 );
-const { FileUtils } = ChromeUtils.importESModule(
-  "resource://gre/modules/FileUtils.sys.mjs"
-);
+import { FileUtils } from "resource://gre/modules/FileUtils.sys.mjs";
 const { XPCOMUtils } = ChromeUtils.import(
   "resource://gre/modules/XPCOMUtils.jsm"
 );
diff --git a/mail/components/im/moz.build b/mail/components/im/moz.build
index 2ce1328c3f..3780532058 100644
--- a/mail/components/im/moz.build
+++ b/mail/components/im/moz.build
@@ -4,18 +4,18 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 EXTRA_JS_MODULES += [
-    "IMIncomingServer.jsm",
-    "IMProtocolInfo.jsm",
-    "modules/ChatEncryption.jsm",
-    "modules/chatHandler.jsm",
-    "modules/chatIcons.jsm",
-    "modules/chatNotifications.jsm",
-    "modules/GlodaIMSearcher.jsm",
-    "modules/index_im.jsm",
+    "IMIncomingServer.sys.mjs",
+    "IMProtocolInfo.sys.mjs",
+    "modules/ChatEncryption.sys.mjs",
+    "modules/chatHandler.sys.mjs",
+    "modules/chatIcons.sys.mjs",
+    "modules/chatNotifications.sys.mjs",
+    "modules/GlodaIMSearcher.sys.mjs",
+    "modules/index_im.sys.mjs",
 ]
 
 TESTING_JS_MODULES += [
-    "test/TestProtocol.jsm",
+    "test/TestProtocol.sys.mjs",
 ]
 
 JAR_MANIFESTS += ["jar.mn"]
diff --git a/mail/components/im/test/TestProtocol.jsm b/mail/components/im/test/TestProtocol.sys.mjs
similarity index 94%
rename from mail/components/im/test/TestProtocol.jsm
rename to mail/components/im/test/TestProtocol.sys.mjs
index 8676be15a2..dfb5338e19 100644
--- a/mail/components/im/test/TestProtocol.jsm
+++ b/mail/components/im/test/TestProtocol.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/. */
 
-var EXPORTED_SYMBOLS = [
-  "registerTestProtocol",
-  "unregisterTestProtocol",
-  "TestProtocol",
-];
-
-var {
+import {
   GenericAccountPrototype,
   GenericConvChatPrototype,
   GenericConvIMPrototype,
@@ -17,10 +11,9 @@ var {
   GenericConvChatBuddyPrototype,
   GenericMessagePrototype,
   TooltipInfo,
-} = ChromeUtils.importESModule("resource:///modules/jsProtoHelper.sys.mjs");
-var { nsSimpleEnumerator } = ChromeUtils.importESModule(
-  "resource:///modules/imXPCOMUtils.sys.mjs"
-);
+} from "resource:///modules/jsProtoHelper.sys.mjs";
+
+import { nsSimpleEnumerator } from "resource:///modules/imXPCOMUtils.sys.mjs";
 
 function Message(who, text, properties, conversation) {
   this._init(who, text, properties, conversation);
@@ -255,7 +248,7 @@ Account.prototype = {
   remove() {},
 };
 
-function TestProtocol() {}
+export function TestProtocol() {}
 TestProtocol.prototype = {
   __proto__: GenericProtocolPrototype,
   get id() {
@@ -295,7 +288,7 @@ TestProtocol.prototype = {
   classID: Components.ID("{a4617631-b8b8-4053-8afa-5c4c43498280}"),
 };
 
-function registerTestProtocol() {
+export function registerTestProtocol() {
   Services.catMan.addCategoryEntry(
     "im-protocol-plugin",
     TestProtocol.prototype.id,
@@ -305,7 +298,7 @@ function registerTestProtocol() {
   );
 }
 
-function unregisterTestProtocol() {
+export function unregisterTestProtocol() {
   Services.catMan.deleteCategoryEntry(
     "im-protocol-plugin",
     TestProtocol.prototype.id,
diff --git a/mail/components/im/test/browser/browser_chatNotifications.js b/mail/components/im/test/browser/browser_chatNotifications.js
index e8c91e1d49..a3a7cd6d01 100644
--- a/mail/components/im/test/browser/browser_chatNotifications.js
+++ b/mail/components/im/test/browser/browser_chatNotifications.js
@@ -9,7 +9,9 @@
 const { MockRegistrar } = ChromeUtils.import(
   "resource://testing-common/MockRegistrar.jsm"
 );
-const { ChatIcons } = ChromeUtils.import("resource:///modules/chatIcons.jsm");
+const { ChatIcons } = ChromeUtils.importESModule(
+  "resource:///modules/chatIcons.sys.mjs"
+);
 
 let originalAlertsServiceCID;
 let alertShown;
diff --git a/mail/components/im/test/browser/head.js b/mail/components/im/test/browser/head.js
index 17be96f8a4..cd910d7fed 100644
--- a/mail/components/im/test/browser/head.js
+++ b/mail/components/im/test/browser/head.js
@@ -2,8 +2,11 @@
  * 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/. */
 
-var { registerTestProtocol, unregisterTestProtocol } = ChromeUtils.import(
-  "resource://testing-common/TestProtocol.jsm"
+var {
+  registerTestProtocol,
+  unregisterTestProtocol,
+} = ChromeUtils.importESModule(
+  "resource://testing-common/TestProtocol.sys.mjs"
 );
 var { IMServices } = ChromeUtils.importESModule(
   "resource:///modules/IMServices.sys.mjs"
diff --git a/mail/components/im/test/components.conf b/mail/components/im/test/components.conf
index d39f70ba28..3f8c09fc09 100644
--- a/mail/components/im/test/components.conf
+++ b/mail/components/im/test/components.conf
@@ -8,7 +8,7 @@ Classes = [
   {
     'cid': '{a4617631-b8b8-4053-8afa-5c4c43498280}',
     'contract_ids': ['@mozilla.org/chat/mochitest;1'],
-    'jsm': 'resource://testing-common/TestProtocol.jsm',
+    'esModule': 'resource://testing-common/TestProtocol.sys.mjs',
     'constructor': 'TestProtocol',
   },
 ]