Issue 6188 - Add-ons option is being shown

mobile/android/app/src/main/res/menu-large/browser_app_menu.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/. -->
 
 <!-- We disable AlwaysShowAction because we interpret the menu
      attributes ourselves and thus the warning isn't relevant to us. -->
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:tools="http://schemas.android.com/tools"
       tools:ignore="AlwaysShowAction">
@@ skipping 80 matching lines @@
 
     <item android:id="@+id/tools"
           android:title="@string/tools">
 
         <menu>
 
             <item android:id="@+id/downloads"
                   android:title="@string/downloads"/>
 
             <item android:id="@+id/addons"
-                  android:visible="false"

[diegocarloslima, 2018/01/05 20:46:25]

Since we're forcing add-ons to be hidden in BrowserApp.java, we can revert the
changes we previously made in browser_app_menu.xml

                   android:title="@string/addons"/>
 
             <item android:id="@+id/logins"
                   android:title="@string/logins"/>
 
             <item android:id="@+id/new_guest_session"
                   android:visible="false"
                   android:title="@string/new_guest_session"/>
 
             <item android:id="@+id/exit_guest_session"
                   android:visible="false"
                   android:title="@string/exit_guest_session"/>
 
         </menu>
 
     </item>
 
     <item android:id="@+id/char_encoding"
           android:visible="false"
           android:title="@string/char_encoding"/>
 
     <item android:id="@+id/settings"
           android:title="@string/settings" />
 
     <item android:id="@+id/help"
           android:visible="false"
           android:title="@string/help_menu" />
 
 </menu>