fenix/app/src/main/res/layout/tab_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/. -->
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/tabs_header"
    android:layout_marginBottom="8dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/header_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4.5dp"
        android:text="@string/tab_header_label"
        android:textAppearance="@style/HeaderTextStyle"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintEnd_toEndOf="parent">
        <ImageButton
            android:id="@+id/add_tab_button"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:background="?android:attr/selectableItemBackgroundBorderless"
            android:contentDescription="@string/add_tab"
            android:src="@drawable/ic_new"/>

        <ImageButton
            android:id="@+id/share_tabs_button"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:background="?android:attr/selectableItemBackgroundBorderless"
            android:contentDescription="@string/tabs_menu_share_tabs"
            android:src="@drawable/ic_hollow_share"/>

        <ImageButton
            android:id="@+id/close_tabs_button"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:background="?android:attr/selectableItemBackgroundBorderless"
            android:contentDescription="@string/tabs_menu_close_all_tabs"
            android:src="@drawable/ic_delete"/>

        <ImageButton
            android:id="@+id/tabs_overflow_button"
            android:layout_width="48dp"
            android:layout_height="48dp"
            android:background="?android:attr/selectableItemBackgroundBorderless"
            android:contentDescription="@string/open_tabs_menu"
            android:src="@drawable/ic_menu" />
    </LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>