STR:
  - Go to https://mozilla.github.io/pdf.js/web/viewer.html
  - Click on "Open File" and open a pdf

The `Download` button and the `Current view` one just disappear.
I can reproduce this bug with Firefox nightly, Chrome stable and Epiphany on debian.
const { debuggerScriptPath, mainContainer } = PDFViewerApplication.appConfig;
  await loadScript(debuggerScriptPath);
  PDFBug.init({ OPS }, mainContainer, enabledTabs);
}
function reportPageStatsPDFBug({ pageNumber }) {
  if (typeof Stats === "undefined" || !Stats.enabled) {
    return;
  }
  const pageView = PDFViewerApplication.pdfViewer.getPageView(
     pageNumber - 1
  );
  const pageStats = pageView?.pdfPage?.stats;
  if (!pageStats) {
    return;
  }
  Stats.add(pageNumber, pageStats);
}
function webViewerInitialized() {
  const appConfig = PDFViewerApplication.appConfig;
  let file;
  if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
    const queryString = document.location.search.substring(1);
    const params = parseQueryString(queryString);