diff --git a/chrome/content/zotero/fileInterface.js b/chrome/content/zotero/fileInterface.js
index 1dd4a25a15..d5329bbae2 100644
--- a/chrome/content/zotero/fileInterface.js
+++ b/chrome/content/zotero/fileInterface.js
@@ -703,27 +703,20 @@ var Zotero_File_Interface = new function () {
 	
 	
 	var _getMendeleyTranslation = async function () {
+		let Zotero_Import_Mendeley;
 		if (true) {
-			Cu.import("chrome://zotero/content/import/mendeley/mendeleyImport.js");
+			({ Zotero_Import_Mendeley } = ChromeUtils.importESModule("chrome://zotero/content/import/mendeley/mendeleyImport.js"));
 		}
 		// TEMP: Load uncached from ~/zotero-client for development
 		else {
-			ChromeUtils.importESModule("resource://gre/modules/FileUtils.sys.mjs");
+			const { FileUtils } = ChromeUtils.importESModule("resource://gre/modules/FileUtils.sys.mjs");
 			let file = FileUtils.getDir("Home", []);
 			file = OS.Path.join(
 				file.path,
 				'zotero-client', 'chrome', 'content', 'zotero', 'import', 'mendeley', 'mendeleyImport.js'
 			);
 			let fileURI = OS.Path.toFileURI(file);
-			let xmlhttp = await Zotero.HTTP.request(
-				'GET',
-				fileURI,
-				{
-					noCache: true,
-					responseType: 'text'
-				}
-			);
-			eval(xmlhttp.response);
+			({ Zotero_Import_Mendeley } = ChromeUtils.importESModule(fileURI));
 		}
 		return new Zotero_Import_Mendeley();
 	};
diff --git a/chrome/content/zotero/import/mendeley/mendeleyImport.js b/chrome/content/zotero/import/mendeley/mendeleyImport.mjs
similarity index 99%
rename from chrome/content/zotero/import/mendeley/mendeleyImport.js
rename to chrome/content/zotero/import/mendeley/mendeleyImport.mjs
index 7e0bc60075..dcb0b3a1a9 100644
--- a/chrome/content/zotero/import/mendeley/mendeleyImport.js
+++ b/chrome/content/zotero/import/mendeley/mendeleyImport.mjs
@@ -1,8 +1,6 @@
- 
-/* global mendeleyDBMaps:false, mendeleyOnlineMappings:false, mendeleyAPIUtils:false, PathUtils: false */
-var EXPORTED_SYMBOLS = ["Zotero_Import_Mendeley"];  
+/* global mendeleyDBMaps:false, mendeleyOnlineMappings:false, mendeleyAPIUtils:false */
+import { OS } from "chrome://zotero/content/osfile.mjs";
 
-var { OS } = ChromeUtils.importESModule("chrome://zotero/content/osfile.mjs");
 Services.scriptloader.loadSubScript("chrome://zotero/content/include.js");
 Services.scriptloader.loadSubScript("chrome://zotero/content/import/mendeley/mendeleyOnlineMappings.js");
 Services.scriptloader.loadSubScript("chrome://zotero/content/import/mendeley/mendeleyAPIUtils.js");
@@ -24,7 +22,7 @@ colorMap.set('#d3c2ff', '#a28ae5');
 colorMap.set('rgb(220, 255, 176)', '#5fb236');
 colorMap.set('#dcffb0', '#5fb236');
 
-var Zotero_Import_Mendeley = function () {
+export var Zotero_Import_Mendeley = function () {
 	this.createNewCollection = null;
 	this.linkFiles = null;
 	this.newItems = [];