For #11267 - Announce "Your open tabs will be shown here (#11272)

app/src/main/java/org/mozilla/fenix/tabtray/TabTrayView.kt

@@ -192,6 +192,7 @@ class TabTrayView(
                 }
             }
 
+            view.tabsTray.asView().isVisible = !hasNoTabs
             view.tab_tray_overflow.isVisible = !hasNoTabs
         }
     }

app/src/main/res/layout/component_tabstray.xml

@@ -32,13 +32,14 @@
         android:gravity="center_horizontal"
         android:paddingTop="80dp"
         android:text="@string/no_open_tabs_description"
+        android:focusable="true"
+        android:focusableInTouchMode="true"
         android:textColor="?secondaryText"
         android:textSize="16sp"
-        android:visibility="gone"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="@id/tabsTray" />
+        app:layout_constraintTop_toBottomOf="@id/tab_layout" />
 
     <com.google.android.material.tabs.TabLayout
         android:id="@+id/tab_layout"