--- a/devtools/client/inspector/inspector.js
+++ b/devtools/client/inspector/inspector.js
@@ -3,47 +3,50 @@
 /* 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/. */
 
 /* global window, BrowserLoader */
 
 "use strict";
 
-var Services = require("Services");
-var promise = require("promise");
-var EventEmitter = require("devtools/shared/old-event-emitter");
+const Services = require("Services");
+const promise = require("promise");
+const EventEmitter = require("devtools/shared/old-event-emitter");
 const {executeSoon} = require("devtools/shared/DevToolsUtils");
-var KeyShortcuts = require("devtools/client/shared/key-shortcuts");
-var {Task} = require("devtools/shared/task");
-const {initCssProperties} = require("devtools/shared/fronts/css-properties");
-const nodeConstants = require("devtools/shared/dom-node-constants");
+const {Task} = require("devtools/shared/task");
+
+// constructor
 const Telemetry = require("devtools/client/shared/telemetry");
-
-const Menu = require("devtools/client/framework/menu");
-const MenuItem = require("devtools/client/framework/menu-item");
-
-const {HTMLBreadcrumbs} = require("devtools/client/inspector/breadcrumbs");
-const ExtensionSidebar = require("devtools/client/inspector/extensions/extension-sidebar");
-const GridInspector = require("devtools/client/inspector/grids/grid-inspector");
-const {InspectorSearch} = require("devtools/client/inspector/inspector-search");
 const HighlightersOverlay = require("devtools/client/inspector/shared/highlighters-overlay");
 const ReflowTracker = require("devtools/client/inspector/shared/reflow-tracker");
-const {ToolSidebar} = require("devtools/client/inspector/toolsidebar");
-const MarkupView = require("devtools/client/inspector/markup/markup");
-const {CommandUtils} = require("devtools/client/shared/developer-toolbar");
-const {ViewHelpers} = require("devtools/client/shared/widgets/view-helpers");
-const clipboardHelper = require("devtools/shared/platform/clipboard");
+const Store = require("devtools/client/inspector/store");
 
-const Store = require("devtools/client/inspector/store");
+loader.lazyRequireGetter(this, "initCssProperties", "devtools/shared/fronts/css-properties", true);
+loader.lazyRequireGetter(this, "HTMLBreadcrumbs", "devtools/client/inspector/breadcrumbs", true);
+loader.lazyRequireGetter(this, "KeyShortcuts", "devtools/client/shared/key-shortcuts");
+loader.lazyRequireGetter(this, "GridInspector", "devtools/client/inspector/grids/grid-inspector");
+loader.lazyRequireGetter(this, "InspectorSearch", "devtools/client/inspector/inspector-search", true);
+loader.lazyRequireGetter(this, "ToolSidebar", "devtools/client/inspector/toolsidebar", true);
+loader.lazyRequireGetter(this, "MarkupView", "devtools/client/inspector/markup/markup");
+
+loader.lazyRequireGetter(this, "nodeConstants", "devtools/shared/dom-node-constants");
+loader.lazyRequireGetter(this, "Menu", "devtools/client/framework/menu");
+loader.lazyRequireGetter(this, "MenuItem", "devtools/client/framework/menu-item");
+loader.lazyRequireGetter(this, "ExtensionSidebar", "devtools/client/inspector/extensions/extension-sidebar");
+loader.lazyRequireGetter(this, "CommandUtils", "devtools/client/shared/developer-toolbar", true);
+loader.lazyRequireGetter(this, "ViewHelpers", "devtools/client/shared/widgets/view-helpers", true);
+loader.lazyRequireGetter(this, "clipboardHelper", "devtools/shared/platform/clipboard");
 
 const {LocalizationHelper, localizeMarkup} = require("devtools/shared/l10n");
 const INSPECTOR_L10N =
       new LocalizationHelper("devtools/client/locales/inspector.properties");
-const TOOLBOX_L10N = new LocalizationHelper("devtools/client/locales/toolbox.properties");
+loader.lazyGetter(this, "TOOLBOX_L10N", function () {
+  return new LocalizationHelper("devtools/client/locales/toolbox.properties");
+});
 
 // Sidebar dimensions
 const INITIAL_SIDEBAR_SIZE = 350;
 
 // If the toolbox width is smaller than given amount of pixels,
 // the sidebar automatically switches from 'landscape' to 'portrait' mode.
 const PORTRAIT_MODE_WIDTH = 700;
 

--- a/devtools/client/inspector/inspector.xhtml
+++ b/devtools/client/inspector/inspector.xhtml
@@ -28,17 +28,17 @@
   <script type="application/javascript"
           src="chrome://devtools/content/shared/theme-switching.js"></script>
   <script type="text/javascript">
     /* eslint-disable */
     var isInChrome = window.location.href.includes("chrome:");
     if (isInChrome) {
       var exports = {};
       var Cu = Components.utils;
-      var { require } = Cu.import("resource://devtools/shared/Loader.jsm", {});
+      var { require, loader } = Cu.import("resource://devtools/shared/Loader.jsm", {});
       var { BrowserLoader } = Cu.import("resource://devtools/client/shared/browser-loader.js", {});
     }
   </script>
 
   <!-- in content, inspector.js is mapped to the dynamically generated webpack bundle -->
   <script type="application/javascript" src="inspector.js" defer="true"></script>
 </head>
 <body class="theme-body" role="application">