diff --git a/chrome/content/zotero/ZoteroProtocolHandler.mjs b/chrome/content/zotero/ZoteroProtocolHandler.mjs
index 77a5f3c7a7..50f2099aa9 100644
--- a/chrome/content/zotero/ZoteroProtocolHandler.mjs
+++ b/chrome/content/zotero/ZoteroProtocolHandler.mjs
@@ -32,7 +32,6 @@ const ZOTERO_PROTOCOL_CID = Components.ID("{9BC3D762-9038-486A-9D70-C997AF848A7C
 const ZOTERO_PROTOCOL_CONTRACTID = "@mozilla.org/network/protocol;1?name=" + ZOTERO_SCHEME;
 const ZOTERO_PROTOCOL_NAME = "Zotero Chrome Extension Protocol";
 
-ChromeUtils.importESModule("resource://gre/modules/ComponentUtils.sys.mjs");
 import { NetUtil } from "resource://gre/modules/NetUtil.sys.mjs";
 
 const Cc = Components.classes;
@@ -1404,7 +1403,6 @@ AsyncChannel.prototype = {
 					this.contentType = Zotero.MIME.getMIMETypeFromData(sample);
 				}
 				
-				ChromeUtils.importESModule("resource://gre/modules/NetUtil.sys.mjs");
 				NetUtil.asyncFetch({ uri: data, loadUsingSystemPrincipal: true }, function (inputStream, status) {
 					if (!Components.isSuccessCode(status)) {
 						reject();
diff --git a/chrome/content/zotero/xpcom/translation/translate_firefox.js b/chrome/content/zotero/xpcom/translation/translate_firefox.js
index 7e08e5065d..6d46959a65 100644
--- a/chrome/content/zotero/xpcom/translation/translate_firefox.js
+++ b/chrome/content/zotero/xpcom/translation/translate_firefox.js
@@ -34,8 +34,6 @@ const BOMs = {
 	"UTF-32LE":"\xFF\xFE\x00\x00"
 }
 
-ChromeUtils.importESModule("resource://gre/modules/NetUtil.sys.mjs");
-
 Zotero.Translate.DOMWrapper = new function () {
 	var Cu = Components.utils;
 	
diff --git a/chrome/content/zotero/zotero-autocomplete.mjs b/chrome/content/zotero/zotero-autocomplete.mjs
index 005065f105..3b8a5ca553 100644
--- a/chrome/content/zotero/zotero-autocomplete.mjs
+++ b/chrome/content/zotero/zotero-autocomplete.mjs
@@ -30,8 +30,6 @@ const Cc = Components.classes;
 const Ci = Components.interfaces;
 const Cr = Components.results;
 
-ChromeUtils.importESModule("resource://gre/modules/ComponentUtils.sys.mjs");
-
 import { Zotero } from "chrome://zotero/content/zotero.mjs";
 
 /*