Backed out 2 changesets (bug 1834176) for causing xpc failures in test_unload.js CLOSED TREE

Backed out changeset 57876d77a652 (bug 1834176)
Backed out changeset ae2f0837b528 (bug 1834176)

Author: nerli1

browser/base/content/browser.js

@@ -34,7 +34,6 @@ ChromeUtils.defineESModuleGetters(this, {
   LoginHelper: "resource://gre/modules/LoginHelper.sys.mjs",
   LoginManagerParent: "resource://gre/modules/LoginManagerParent.sys.mjs",
   MigrationUtils: "resource:///modules/MigrationUtils.sys.mjs",
-  NetUtil: "resource://gre/modules/NetUtil.sys.mjs",
   NewTabUtils: "resource://gre/modules/NewTabUtils.sys.mjs",
   NimbusFeatures: "resource://nimbus/ExperimentAPI.sys.mjs",
   PageThumbs: "resource://gre/modules/PageThumbs.sys.mjs",
@@ -91,6 +90,7 @@ XPCOMUtils.defineLazyModuleGetters(this, {
   CustomizableUI: "resource:///modules/CustomizableUI.jsm",
   ExtensionsUI: "resource:///modules/ExtensionsUI.jsm",
   HomePage: "resource:///modules/HomePage.jsm",
+  NetUtil: "resource://gre/modules/NetUtil.jsm",
   OpenInTabsUtils: "resource:///modules/OpenInTabsUtils.jsm",
   PageActions: "resource:///modules/PageActions.jsm",
   ProcessHangMonitor: "resource:///modules/ProcessHangMonitor.jsm",

browser/base/content/test/performance/PerfTestHelpers.sys.mjs

@@ -3,9 +3,11 @@
 
 const lazy = {};
 
-ChromeUtils.defineESModuleGetters(lazy, {
-  NetUtil: "resource://gre/modules/NetUtil.sys.mjs",
-});
+ChromeUtils.defineModuleGetter(
+  lazy,
+  "NetUtil",
+  "resource://gre/modules/NetUtil.jsm"
+);
 
 export var PerfTestHelpers = {
   /**