gecko-dev/mobile/android/base/resources/layout/text_selection_handles.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">

   <org.mozilla.gecko.TextSelectionHandle android:id="@+id/start_handle"
                                          android:layout_width="@dimen/text_selection_handle_width"
                                          android:layout_height="@dimen/text_selection_handle_height"
                                          android:src="@drawable/handle_start_level"
                                          android:visibility="gone"
                                          gecko:handleType="start"/>

   <org.mozilla.gecko.TextSelectionHandle android:id="@+id/middle_handle"
                                          android:layout_width="@dimen/text_selection_handle_width"
                                          android:layout_height="@dimen/text_selection_handle_height"
                                          android:src="@drawable/handle_middle"
                                          android:visibility="gone"
                                          gecko:handleType="middle"/>

   <org.mozilla.gecko.TextSelectionHandle android:id="@+id/end_handle"
                                          android:layout_width="@dimen/text_selection_handle_width"
                                          android:layout_height="@dimen/text_selection_handle_height"
                                          android:src="@drawable/handle_end_level"
                                          android:visibility="gone"
                                          gecko:handleType="end"/>
</merge>