I was wondering if WebGL is considered stable enough to be enabled by default. It makes some PDFs render much faster and it has been off by default for a while now, so we have had quite some time to test it.

If we decide to enable WebGL by default, we should not forget to update https://github.com/mozilla/pdf.js/blob/master/extensions/chromium/preferences_schema.json#L39 as well.

/cc @yurydelendik 
/cc @Snuffleupagus (because IIRC you were testing WebGL too)

const appConfig = PDFViewerApplication.appConfig;
  return loadScript(appConfig.debuggerScriptPath).then(function () {
    PDFBug.enable(enabledTabs);
    PDFBug.init({ OPS }, appConfig.mainContainer);
  });
}
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);