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.isViewerEmbedded) {
            pdfViewer.focus();
          }
          
          
          this._initializePermissions(pdfDocument);
          
          
          
          
          
          await Promise.race([
            pagesPromise,
            new Promise(resolve => {
              setTimeout(resolve, FORCE_PAGES_LOADED_TIMEOUT);
            }),
          ]);
          if (!initialBookmark && !hash) {
            return;
          }
          if (pdfViewer.hasEqualPageSizes) {
            return;
          }
          this.initialBookmark = initialBookmark;
          
          pdfViewer.currentScaleValue = pdfViewer.currentScaleValue;
          
          this.setInitialView(hash);