Follow up with issue: https://github.com/mozilla/pdf.js/issues/14146
Merged pull req: https://github.com/mozilla/pdf.js/pull/14189

Attach (recommended) or Link to PDF file here:
https://bug1708641.bmoattachments.org/attachment.cgi?id=9219459

- This popup appears because JS is enabled;
- And because the pdf contains some unsupported features (e.g. XFA);

Configuration:
- Firefox Nightly & Chrome
- macOS Big Sur 11.6

Steps to reproduce the problem:
1. Run gulp server
2. Open attached pdf

What is the expected behavior? 
No popup on open

What went wrong?
![error](https://user-images.githubusercontent.com/76935202/139354112-707887a2-a6a1-43a9-a92e-45d57c48206a.jpg)



return [this._document.wrapped];
  }
  set activeDocs(_) {
    throw new Error("app.activeDocs is read-only");
  }
  get calculate() {
    return this._document.obj.calculate;
  }
  set calculate(calculate) {
    this._document.obj.calculate = calculate;
  }
  get constants() {
    if (!this._constants) {
      this._constants = Object.freeze({
        align: Object.freeze({
          left: 0,
          center: 1,
          right: 2,
          top: 3,
          bottom: 4,
        }),
      });
    }
    return this._constants;
  }
  set constants(_) {