diff --git a/browser/actors/RFPHelperParent.sys.mjs b/browser/actors/RFPHelperParent.sys.mjs
index d83c010a6a37..0e4e3e8be642 100644
--- a/browser/actors/RFPHelperParent.sys.mjs
+++ b/browser/actors/RFPHelperParent.sys.mjs
@@ -6,11 +6,9 @@
 import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 
 const lazy = {};
-ChromeUtils.defineModuleGetter(
-  lazy,
-  "RFPHelper",
-  "resource://gre/modules/RFPHelper.jsm"
-);
+ChromeUtils.defineESModuleGetters(lazy, {
+  RFPHelper: "resource://gre/modules/RFPHelper.sys.mjs",
+});
 
 const kPrefLetterboxing = "privacy.resistFingerprinting.letterboxing";
 
diff --git a/browser/components/BrowserGlue.sys.mjs b/browser/components/BrowserGlue.sys.mjs
index 5333e1031386..4b21c32b64fd 100644
--- a/browser/components/BrowserGlue.sys.mjs
+++ b/browser/components/BrowserGlue.sys.mjs
@@ -50,6 +50,7 @@ ChromeUtils.defineESModuleGetters(lazy, {
   PublicSuffixList:
     "resource://gre/modules/netwerk-dns/PublicSuffixList.sys.mjs",
   QuickSuggest: "resource:///modules/QuickSuggest.sys.mjs",
+  RFPHelper: "resource://gre/modules/RFPHelper.sys.mjs",
 
   RemoteSecuritySettings:
     "resource://gre/modules/psm/RemoteSecuritySettings.sys.mjs",
@@ -100,7 +101,6 @@ XPCOMUtils.defineLazyModuleGetters(lazy, {
   PdfJs: "resource://pdf.js/PdfJs.jsm",
   PluralForm: "resource://gre/modules/PluralForm.jsm",
   ProcessHangMonitor: "resource:///modules/ProcessHangMonitor.jsm",
-  RFPHelper: "resource://gre/modules/RFPHelper.jsm",
   SafeBrowsing: "resource://gre/modules/SafeBrowsing.jsm",
   Sanitizer: "resource:///modules/Sanitizer.jsm",
   SaveToPocket: "chrome://pocket/content/SaveToPocket.jsm",
diff --git a/browser/components/resistfingerprinting/test/browser/browser_dynamical_window_rounding.js b/browser/components/resistfingerprinting/test/browser/browser_dynamical_window_rounding.js
index 3c5dc5e74515..e6a77bfb598d 100644
--- a/browser/components/resistfingerprinting/test/browser/browser_dynamical_window_rounding.js
+++ b/browser/components/resistfingerprinting/test/browser/browser_dynamical_window_rounding.js
@@ -10,8 +10,8 @@
  * example.
  */
 
-const { RFPHelper } = ChromeUtils.import(
-  "resource://gre/modules/RFPHelper.jsm"
+const { RFPHelper } = ChromeUtils.importESModule(
+  "resource://gre/modules/RFPHelper.sys.mjs"
 );
 
 // A set of test cases which defines the width and the height of the outer window.
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index 361a39f89893..9a5a98b7d807 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -13020,7 +13020,7 @@
   value: true
   mirror: always
 
-# The log level for browser console messages logged in RFPHelper.jsm. Change to
+# The log level for browser console messages logged in RFPHelper.sys.mjs. Change to
 # 'All' and restart to see the messages.
 - name: privacy.resistFingerprinting.jsmloglevel
   type: String
diff --git a/toolkit/components/resistfingerprinting/RFPHelper.jsm b/toolkit/components/resistfingerprinting/RFPHelper.sys.mjs
similarity index 98%
rename from toolkit/components/resistfingerprinting/RFPHelper.jsm
rename to toolkit/components/resistfingerprinting/RFPHelper.sys.mjs
index 326701ff13eb..ac15846d17eb 100644
--- a/toolkit/components/resistfingerprinting/RFPHelper.jsm
+++ b/toolkit/components/resistfingerprinting/RFPHelper.sys.mjs
@@ -2,13 +2,8 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * 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";
 
-var EXPORTED_SYMBOLS = ["RFPHelper"];
-
-const { XPCOMUtils } = ChromeUtils.importESModule(
-  "resource://gre/modules/XPCOMUtils.sys.mjs"
-);
+import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
 
 const kPrefResistFingerprinting = "privacy.resistFingerprinting";
 const kPrefSpoofEnglish = "privacy.spoof_english";
@@ -648,4 +643,4 @@ class _RFPHelper {
   }
 }
 
-let RFPHelper = new _RFPHelper();
+export let RFPHelper = new _RFPHelper();
diff --git a/toolkit/components/resistfingerprinting/moz.build b/toolkit/components/resistfingerprinting/moz.build
index ce6dd42dd079..75779374317f 100644
--- a/toolkit/components/resistfingerprinting/moz.build
+++ b/toolkit/components/resistfingerprinting/moz.build
@@ -22,5 +22,5 @@ EXPORTS.mozilla += [
 ]
 
 EXTRA_JS_MODULES += [
-    "RFPHelper.jsm",
+    "RFPHelper.sys.mjs",
 ]
diff --git a/toolkit/modules/FinderParent.sys.mjs b/toolkit/modules/FinderParent.sys.mjs
index 4aef4823d65a..62851edb36df 100644
--- a/toolkit/modules/FinderParent.sys.mjs
+++ b/toolkit/modules/FinderParent.sys.mjs
@@ -14,13 +14,9 @@ const lazy = {};
 
 ChromeUtils.defineESModuleGetters(lazy, {
   GetClipboardSearchString: "resource://gre/modules/Finder.sys.mjs",
+  RFPHelper: "resource://gre/modules/RFPHelper.sys.mjs",
   Rect: "resource://gre/modules/Geometry.sys.mjs",
 });
-ChromeUtils.defineModuleGetter(
-  lazy,
-  "RFPHelper",
-  "resource://gre/modules/RFPHelper.jsm"
-);
 
 const kPrefLetterboxing = "privacy.resistFingerprinting.letterboxing";