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)



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  response(cQuestion, cTitle = "", cDefault = "", bPassword = "", cLabel = "") {
    if (typeof cQuestion === "object") {
      cDefault = cQuestion.cDefault;
      cQuestion = cQuestion.cQuestion;
    }
    cQuestion = (cQuestion || "").toString();
    cDefault = (cDefault || "").toString();
    return this._externalCall("prompt", [cQuestion, cDefault || ""]);
  }
  setInterval(cExpr, nMilliseconds = 0) {
    if (typeof cExpr === "object") {
      nMilliseconds = cExpr.nMilliseconds || 0;
      cExpr = cExpr.cExpr;
    }
    if (typeof cExpr !== "string") {
      throw new TypeError("First argument of app.setInterval must be a string");
    }
    if (typeof nMilliseconds !== "number") {
      throw new TypeError(
        "Second argument of app.setInterval must be a number"
      );
    }
    const callbackId = this._registerTimeoutCallback(cExpr);
    this._externalCall("setInterval", [callbackId, nMilliseconds]);
    return this._registerTimeout(callbackId, true);
  }
  setTimeOut(cExpr, nMilliseconds = 0) {