diff --git a/devtools/client/performance-new/test/browser/browser.ini b/devtools/client/performance-new/test/browser/browser.ini
index 1381ed7c95f9..1c1a501b1cc5 100644
--- a/devtools/client/performance-new/test/browser/browser.ini
+++ b/devtools/client/performance-new/test/browser/browser.ini
@@ -27,3 +27,4 @@ support-files =
 [browser_webchannel-enable-menu-button.js]
 [browser_popup-record-capture.js]
 [browser_popup-record-discard.js]
+[browser_popup-private-browsing.js]
diff --git a/devtools/client/performance-new/test/browser/browser_popup-private-browsing.js b/devtools/client/performance-new/test/browser/browser_popup-private-browsing.js
new file mode 100644
index 000000000000..cd4b47c0de07
--- /dev/null
+++ b/devtools/client/performance-new/test/browser/browser_popup-private-browsing.js
@@ -0,0 +1,46 @@
+/* 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";
+
+add_task(async function test() {
+  info(
+    "Test that the profiler popup gets disabled when a private browsing window is open."
+  );
+  await makeSureProfilerPopupIsEnabled();
+  await toggleOpenProfilerPopup();
+
+  const getRecordingButton = () =>
+    getElementByLabel(document, "Start Recording");
+  const getDisabledMessage = () =>
+    getElementFromDocumentByText(
+      document,
+      "The profiler is currently disabled"
+    );
+
+  ok(await getRecordingButton(), "The start recording button is available");
+
+  info("Open a private browsing window.");
+  const privateWindow = await BrowserTestUtils.openNewBrowserWindow({
+    private: true,
+  });
+
+  info("Switch back to the main window and open the popup again.");
+  window.focus();
+  await toggleOpenProfilerPopup();
+
+  ok(await getDisabledMessage(), "The disabled message is displayed.");
+
+  info("Close the private window");
+  await BrowserTestUtils.closeWindow(privateWindow);
+
+  info("Make sure the first window is focused, and open the popup back up.");
+  window.focus();
+  await toggleOpenProfilerPopup();
+
+  ok(
+    await getRecordingButton(),
+    "The start recording button is available once again."
+  );
+});