gecko-dev/mobile/android/base/resources/layout-large-land-v11/tabs_panel_header.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">

    <Gecko.IconTabWidget android:id="@+id/tab_widget"
                         android:layout_width="wrap_content"
                         android:layout_height="fill_parent"
                         android:tabStripEnabled="false"
                         android:divider="@drawable/tab_indicator_divider"/>

</merge>