The Tor Browser / file revision

 <?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/. -->

 <selector xmlns:android="http://schemas.android.com/apk/res/android">

     <item android:state_pressed="true">

         <shape>

             <solid android:color="@color/highlight" />

         </shape>

     </item>

     <item android:state_focused="true"

           android:state_pressed="false">

         <shape>

             <solid android:color="@color/highlight_focused" />

         </shape>

     </item>

     <item android:drawable="@android:color/transparent"/>

 </selector>