gecko/mobile/android/base/resources/layout/tabs_panel.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/. -->

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

    <view class="org.mozilla.gecko.TabsPanel$TabsPanelToolbar"
          android:id="@+id/toolbar"
          android:layout_width="fill_parent"
          android:layout_height="@dimen/browser_toolbar_height"/>

    <view class="org.mozilla.gecko.TabsPanel$TabsListContainer"
          android:id="@+id/list_container"
          android:layout_width="fill_parent"
          android:layout_height="fill_parent"
          android:orientation="vertical"
          android:background="@drawable/tabs_tray_bg_repeat"/>

</merge>