diff -r 000000000000 -r 6474c204b198 browser/modules/Windows8WindowFrameColor.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/modules/Windows8WindowFrameColor.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* 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";
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+this.EXPORTED_SYMBOLS = ["Windows8WindowFrameColor"];
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+let Registry = Cu.import("resource://gre/modules/WindowsRegistry.jsm").WindowsRegistry;
+
+const Windows8WindowFrameColor = {
+  _windowFrameColor: null,
+
+  get: function() {
+    if (this._windowFrameColor)
+      return this._windowFrameColor;
+
+    const HKCU = Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER;
+    const dwmKey = "Software\\Microsoft\\Windows\\DWM";
+    let customizationColor = Registry.readRegKey(HKCU, dwmKey,
+                                                 "ColorizationColor");
+    // The color returned from the Registry is in decimal form.
+    let customizationColorHex = customizationColor.toString(16);
+    // Zero-pad the number just to make sure that it is 8 digits.
+    customizationColorHex = ("00000000" + customizationColorHex).substr(-8);
+    let customizationColorArray = customizationColorHex.match(/../g);
+    let [unused, fgR, fgG, fgB] = customizationColorArray.map(function(val) parseInt(val, 16));
+    let colorizationColorBalance = Registry.readRegKey(HKCU, dwmKey,
+                                                       "ColorizationColorBalance");
+     // Window frame base color when Color Intensity is at 0, see bug 1004576.
+    let frameBaseColor = 217;
+    let alpha = colorizationColorBalance / 100;
+
+    // Alpha-blend the foreground color with the frame base color.
+    let r = Math.round(fgR * alpha + frameBaseColor * (1 - alpha));
+    let g = Math.round(fgG * alpha + frameBaseColor * (1 - alpha));
+    let b = Math.round(fgB * alpha + frameBaseColor * (1 - alpha));
+    return this._windowFrameColor = [r, g, b];
+  },
+};