  - Open https://mozilla.github.io/pdf.js/web/viewer.html
  - Open a pdf with some XFA (for example the on in https://github.com/mozilla/pdf.js/issues/13679#issue-937616350)

The pdf is not correctly displayed because `enableXfa` is false.

@Snuffleupagus, the pref is set to true in Firefox nightly, is there anything blocking setting it to true in the web viewer ?  
/**
   * @param {HTMLDivElement} textLayerDiv
   * @param {number} pageIndex
   * @param {PageViewport} viewport
   * @param {boolean} enhanceTextSelection
   * @param {EventBus} eventBus
   * @param {TextHighlighter} highlighter
   * @returns {TextLayerBuilder}
   */
  createTextLayerBuilder(
    textLayerDiv,
    pageIndex,
    viewport,
    enhanceTextSelection = false,
    eventBus,
    highlighter
  ) {
    return new TextLayerBuilder({
      textLayerDiv,
      pageIndex,
      viewport,
      enhanceTextSelection,
      eventBus,
    });
  }
}
export { DefaultTextLayerFactory, TextLayerBuilder };