gecko-dev/mobile/android/base/resources/layout/toolbar_display_layout.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"
       xmlns:gecko="http://schemas.android.com/apk/res-auto">

    <ImageButton android:id="@+id/favicon"
                 style="@style/UrlBar.ImageButton"
                 android:layout_width="@dimen/browser_toolbar_favicon_size"
                 android:scaleType="fitCenter"
                 android:paddingLeft="4dip"
                 android:paddingRight="4dip"
                 android:layout_gravity="center_vertical"/>

    <ImageButton android:id="@+id/site_security"
                 style="@style/UrlBar.ImageButton"
                 android:layout_width="@dimen/browser_toolbar_lock_width"
                 android:scaleType="fitCenter"
                 android:layout_marginLeft="-4dip"
                 android:src="@drawable/site_security_level"
                 android:contentDescription="@string/site_security"
                 android:visibility="gone"/>

    <org.mozilla.gecko.widget.ThemedTextView android:id="@+id/url_bar_title"
                                             style="@style/UrlBar.Title"
                                             android:layout_width="match_parent"
                                             android:layout_height="match_parent"
                                             android:layout_weight="1.0"
                                             gecko:autoUpdateTheme="false"/>

    <org.mozilla.gecko.toolbar.PageActionLayout android:id="@+id/page_action_layout"
                                                android:layout_width="wrap_content"
                                                android:layout_height="match_parent"
                                                android:visibility="gone"
                                                android:orientation="horizontal"/>

    <ImageButton android:id="@+id/stop"
                 android:layout_width="@dimen/page_action_button_width"
                 android:layout_height="match_parent"
                 android:src="@drawable/urlbar_stop"
                 android:contentDescription="@string/stop"
                 android:background="#00ffffff"
                 android:visibility="gone"/>

</merge>