--- a/devtools/client/framework/devtools.js
+++ b/devtools/client/framework/devtools.js
@@ -586,16 +586,25 @@ DevTools.prototype = {
    * Compatibility layer for web-extensions. Used by DevToolsShim for
    * browser/components/extensions/ext-devtools-inspectedWindow.js
    */
   createWebExtensionInspectedWindowFront: function (tabTarget) {
     return new WebExtensionInspectedWindowFront(tabTarget.client, tabTarget.form);
   },
 
   /**
+   * Compatibility layer for web-extensions. Used by DevToolsShim for
+   * toolkit/components/extensions/ext-c-toolkit.js
+   */
+  openBrowserConsole: function () {
+    let {HUDService} = require("devtools/client/webconsole/hudservice");
+    HUDService.openBrowserConsoleOrFocus();
+  },
+
+  /**
    * Called from the DevToolsShim, used by nsContextMenu.js.
    *
    * @param {XULTab} tab
    *        The browser tab on which inspect node was used.
    * @param {Array} selectors
    *        An array of CSS selectors to find the target node. Several selectors can be
    *        needed if the element is nested in frames and not directly in the root
    *        document.

--- a/devtools/shim/DevToolsShim.jsm
+++ b/devtools/shim/DevToolsShim.jsm
@@ -293,18 +293,19 @@ let addonSdkMethods = [
 
 /**
  * Compatibility layer for webextensions.
  *
  * Those methods are called only after a DevTools webextension was loaded in DevTools,
  * therefore DevTools should always be available when they are called.
  */
 let webExtensionsMethods = [
+  "createWebExtensionInspectedWindowFront",
   "getTargetForTab",
   "getTheme",
-  "createWebExtensionInspectedWindowFront",
+  "openBrowserConsole",
 ];
 
 for (let method of [...addonSdkMethods, ...webExtensionsMethods]) {
   this.DevToolsShim[method] = function () {
     return this.gDevTools[method].apply(this.gDevTools, arguments);
   };
 }

--- a/toolkit/components/extensions/ext-c-toolkit.js
+++ b/toolkit/components/extensions/ext-c-toolkit.js
@@ -1,31 +1,32 @@
 "use strict";
 
 Cu.import("resource://gre/modules/ExtensionCommon.jsm");
 
+XPCOMUtils.defineLazyModuleGetter(this, "Services",
+                                 "resource://gre/modules/Services.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "DevToolsShim",
+                                 "chrome://devtools-shim/content/DevToolsShim.jsm");
+
 // These are defined on "global" which is used for the same scopes as the other
 // ext-c-*.js files.
 /* exported EventManager */
 /* global EventManager: false */
 
 global.EventManager = ExtensionCommon.EventManager;
 
 global.initializeBackgroundPage = (contentWindow) => {
   // Override the `alert()` method inside background windows;
   // we alias it to console.log().
   // See: https://bugzilla.mozilla.org/show_bug.cgi?id=1203394
   let alertDisplayedWarning = false;
   let alertOverwrite = text => {
     if (!alertDisplayedWarning) {
-      require("devtools/client/framework/devtools-browser");
-
-      let {HUDService} = require("devtools/client/webconsole/hudservice");
-      HUDService.openBrowserConsoleOrFocus();
-
+      DevToolsShim.openBrowserConsole();
       contentWindow.console.warn("alert() is not supported in background windows; please use console.log instead.");
 
       alertDisplayedWarning = true;
     }
 
     contentWindow.console.log(text);
   };
   Cu.exportFunction(alertOverwrite, contentWindow, {defineAs: "alert"});