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)

if (!this.documentInfo) {
      
      
      await new Promise(resolve => {
        this.eventBus._on("metadataloaded", resolve, { once: true });
      });
      if (pdfDocument !== this.pdfDocument) {
        return null; 
      }
    }
    if (!this._contentLength) {
      
      
      
      
      
      await new Promise(resolve => {
        this.eventBus._on("documentloaded", resolve, { once: true });
      });
      if (pdfDocument !== this.pdfDocument) {
        return null; 
      }
    }
    return {