UXP-Fixed/mobile/android/base/resources/layout/activity_stream.xml

<?xml version="1.0" encoding="utf-8"?>
<org.mozilla.gecko.home.activitystream.ActivityStreamHomeScreen xmlns:android="http://schemas.android.com/apk/res/android"
                                                      android:orientation="vertical"
                                                      android:layout_width="match_parent"
                                                      android:layout_height="match_parent"
                                                      android:background="#FAFAFA"/>