1 files changed, 12 insertions, 0 deletions
diff --git a/devtools/client/performance-new/test/xpcshell/head.js b/devtools/client/performance-new/test/xpcshell/head.js
new file mode 100644
index 0000000000..83812e9dc1
--- /dev/null
+++ b/devtools/client/performance-new/test/xpcshell/head.js
@@ -0,0 +1,12 @@
+/* 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/. */
+"use strict";
+
+registerCleanupFunction(() => {
+  // Always clean up the prefs after every test.
+  const { revertRecordingSettings } = ChromeUtils.import(
+    "resource://devtools/client/performance-new/shared/background.jsm.js"
+  );
+  revertRecordingSettings();
+});