Attach (recommended) or Link to PDF file here:
https://guichet.public.lu/dam-assets/catalogue-formulaires/tva/tva-option-aic-pers-morales/tva-option-aic-pers-morale-DE.pdf

Configuration:
- Web browser and its version: Firefox Nightly 91.0a1 (2021-06-26) (64-bit)
- Operating system and its version: Windows 10.0.19043.1052
- PDF.js version: N/A

Steps to reproduce the problem:
1. enableXFA in Firefox Nightly
2. Open form

What is the expected behavior? (add screenshot)
Header image is scaled properly
![image](https://user-images.githubusercontent.com/7104454/123525954-905d1f00-d6a2-11eb-840e-be30eee395e1.png)

What went wrong? (add screenshot)
Image is scaled to fit
![image](https://user-images.githubusercontent.com/7104454/123525957-96530000-d6a2-11eb-9991-bf7f37c6f1a5.png)


});
          svg.appendChild(foreignObject);
          writeSVG(svg, ctx, resolve, reject);
        })
        .catch(reason => {
          reject(new Error(`rasterizeXfaLayer: "${reason?.message}".`));
        });
    });
  }
  return rasterizeXfaLayer;
})();
/**
 * @typedef {Object} DriverOptions
 * @property {HTMLSpanElement} inflight - Field displaying the number of
 *   inflight requests.
 * @property {HTMLInputElement} disableScrolling - Checkbox to disable
 *   automatic scrolling of the output container.
 * @property {HTMLPreElement} output - Container for all output messages.
 * @property {HTMLDivElement} end - Container for a completion message.
 */
/**
 * @class
 */
var Driver = (function DriverClosure() {
  /**
   * @constructs Driver
   * @param {DriverOptions} options
   */
  
  function Driver(options) {