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)

assert(
      reason instanceof Error ||
        (typeof reason === "object" && reason !== null),
      'PDFPageProxy._abortOperatorList: Expected "reason" argument.'
    );
    if (!intentState.streamReader) {
      return;
    }
    if (!force) {
      
      
      if (intentState.renderTasks.size > 0) {
        return;
      }
      
      
      
      if (reason instanceof RenderingCancelledException) {
        intentState.streamReaderCancelTimeout = setTimeout(() => {