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)

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    });
    messageHandler.on("DataLoaded", data => {
      
      
      if (loadingTask.onProgress) {
        loadingTask.onProgress({
          loaded: data.length,
          total: data.length,
        });
      }
      this.downloadInfoCapability.resolve(data);
    });
    messageHandler.on("StartRenderPage", data => {
      if (this.destroyed) {
        return; 
      }
      const page = this.pageCache[data.pageIndex];
      page._startRenderPage(data.transparency, data.intent);
    });
    messageHandler.on("commonobj", data => {
      if (this.destroyed) {
        return; 
      }
      const [id, type, exportedData] = data;
      if (this.commonObjs.has(id)) {
        return;
      }
      switch (type) {
        case "Font":