From f9624621d375763b935e7a776a1438c632475bbb Mon Sep 17 00:00:00 2001
From: akkomar <akkomar@users.noreply.github.com>
Date: Tue, 11 Jul 2023 12:03:06 +0200
Subject: [PATCH] FXA-7936 - Fix DNT check in Safari (#1803)

`window.external` is [not available in Safari](https://developer.mozilla.org/en-US/docs/Web/API/Window/external#browser_compatibility).
We need to check if it exists before calling it in order to not break the page load.
---
 src/telemetry/index.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/telemetry/index.js b/src/telemetry/index.js
index 7af8a6a2f..3e4707630 100644
--- a/src/telemetry/index.js
+++ b/src/telemetry/index.js
@@ -17,7 +17,8 @@ const isDNTEnabled =
   navigator.doNotTrack === "yes" ||
   navigator.doNotTrack === "1" ||
   navigator.msDoNotTrack === "1" ||
-  ("msTrackingProtectionEnabled" in window.external &&
+  (typeof window.external !== "undefined" &&
+    "msTrackingProtectionEnabled" in window.external &&
     window.external.msTrackingProtectionEnabled());
 
 /**