capacitor-geckoview-fmode/6.2.1/capacitor/src/main/res/layout/fragment_bridge.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#F0FF1414"
    tools:context="com.getcapacitor.BridgeFragment">

  <com.getcapacitor.CapacitorWebView
      android:id="@+id/webview"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" />

</FrameLayout>