From 03c47b118513c01a9b577c90c8f11ad1fb8f4787 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?D=C3=A3o=20Gottwald?= <dao@mozilla.com>
Date: Thu, 23 Apr 2020 22:15:53 +0000
Subject: [PATCH] Bug 1632166 - Obey prefers-reduced-motion when animating
 toolbars for fullscreen mode. r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D71959
---
 browser/base/content/browser-fullScreenAndPointerLock.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/browser/base/content/browser-fullScreenAndPointerLock.js b/browser/base/content/browser-fullScreenAndPointerLock.js
index 580a77bfab9b..7b45c1c5524b 100644
--- a/browser/base/content/browser-fullScreenAndPointerLock.js
+++ b/browser/base/content/browser-fullScreenAndPointerLock.js
@@ -730,7 +730,7 @@ var FullScreen = {
 
     if (
       aAnimate &&
-      Services.prefs.getBoolPref("toolkit.cosmeticAnimations.enabled") &&
+      window.matchMedia("(prefers-reduced-motion: no-preference)").matches &&
       !BrowserHandler.kiosk
     ) {
       gNavToolbox.setAttribute("fullscreenShouldAnimate", true);