1 files changed, 19 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/xpcshell/head.js b/devtools/client/responsive/test/xpcshell/head.js
new file mode 100644
index 0000000000..ee4933416c
--- /dev/null
+++ b/devtools/client/responsive/test/xpcshell/head.js
@@ -0,0 +1,19 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* eslint no-unused-vars: [2, {"vars": "local"}] */
+
+const { require } = ChromeUtils.importESModule(
+  "resource://devtools/shared/loader/Loader.sys.mjs"
+);
+
+const Store = require("resource://devtools/client/responsive/store.js");
+
+const DevToolsUtils = require("resource://devtools/shared/DevToolsUtils.js");
+
+Services.prefs.setBoolPref("devtools.testing", true);
+registerCleanupFunction(() => {
+  Services.prefs.clearUserPref("devtools.testing");
+});