From bbbd51dbe7d8061ebed307f8037e5910fce6a852 Mon Sep 17 00:00:00 2001
From: Felipe Gomes <felipc@gmail.com>
Date: Mon, 4 Mar 2019 18:53:29 +0000
Subject: [PATCH] Bug 827976 - Use an existing window for media telemetry.
 r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D21086

--HG--
extra : moz-landing-system : lando
---
 browser/components/BrowserGlue.jsm | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/browser/components/BrowserGlue.jsm b/browser/components/BrowserGlue.jsm
index 7c1708ba3d34..4ff9841e3fe7 100644
--- a/browser/components/BrowserGlue.jsm
+++ b/browser/components/BrowserGlue.jsm
@@ -1443,9 +1443,11 @@ BrowserGlue.prototype = {
   },
 
   _sendMediaTelemetry() {
-    let win = Services.appShell.hiddenDOMWindow;
-    let v = win.document.createElementNS("http://www.w3.org/1999/xhtml", "video");
-    v.reportCanPlayTelemetry();
+    let win = Services.wm.getMostRecentWindow("navigator:browser");
+    if (win) {
+      let v = win.document.createElementNS("http://www.w3.org/1999/xhtml", "video");
+      v.reportCanPlayTelemetry();
+    }
   },
 
   /**