From 2319d8be1224882c53f701408b00a9509550dd9f Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <email@mattatobin.com>
Date: Sat, 12 Jun 2021 13:13:08 -0400
Subject: [PATCH] [Toolkit] Don't use the "aero" msstyle provided toolbox
 background on Windows 10

---
 toolkit/themes/windows/global/toolbar.css | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/toolkit/themes/windows/global/toolbar.css b/toolkit/themes/windows/global/toolbar.css
index 38c8a617a5..97310e1aeb 100644
--- a/toolkit/themes/windows/global/toolbar.css
+++ b/toolkit/themes/windows/global/toolbar.css
@@ -17,6 +17,15 @@ toolbox {
   -moz-border-top-colors: ThreeDShadow ThreeDHighlight;
 }
 
+@media (-moz-os-version: windows-win10) and (-moz-windows-theme: aero) {
+  toolbox {
+    /* Windows 10's "aero" msstyle sourced toolbox background is pure white
+       so don't use the widget toolbox styling and fallback to -moz-Dialog's
+       color which by default should be a non-blinding rgb(240, 240, 240) */
+    -moz-appearance: none;
+  }
+}
+
 /* ::::: toolbar & menubar ::::: */
 
 toolbar, menubar {