Issue 3769 - UI colours gone bad

mobile/android/base/resources/values/themes.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- 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/. -->
 
 <resources>
 
+    <!-- Using ABB color palette in some styles. See https://issues.adblockplus.org/ticket/3769 -->
+
     <!--
         Base application theme. This could be overridden by GeckoBaseTheme
         in other res/values-XXX/themes.xml.
 
         Bug 1215079: we inherit from android:* on GB but AppCompat in later versions.
         Inheriting only from the AppCompat style but not extending AppCompat causes the
         menu to be transparent and we can't correctly override the color on all devices
         while also extending AppCompat disables the menu entirely due to a framework bug.
         We're stuck until we always show the overflow menu (bug 1209967).
     -->
@@ skipping 97 matching lines @@
     <!-- Make an activity appear like an overlay. -->
     <style name="OverlayActivity" parent="Gecko">
         <item name="android:windowBackground">@android:color/transparent</item>
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowIsTranslucent">true</item>
         <item name="android:backgroundDimEnabled">true</item>
 
         <!-- Set the app's title bar color in the recent app switcher.
 
              Note: We'd prefer not to show up in the recent app switcher (bug 1137928). -->
-        <item name="android:colorPrimary">@color/text_and_tabs_tray_grey</item>
+        <item name="android:colorPrimary">@color/abb_background_light_grey</item>
         <!-- We display the overlay on top of other Activities so show their status bar. -->
         <item name="android:statusBarColor">@android:color/transparent</item>
     </style>
 
 </resources>