Attach (recommended) or Link to PDF file here:
[output.pdf](https://github.com/mozilla/pdf.js/files/6374987/output.pdf)

Configuration:
- Web browser and its version: Firefox 88.0
- Operating system and its version: macOS Big Sur 11.2.3 (20D91)
- PDF.js version: 2.8.243
- Is a browser extension: no/Firefox built-in

Steps to reproduce the problem:
1.  add Ink-Annotations to a pdf (i use https://github.com/highkite/pdfAnnotate, Annotations with appearance streams are shown correctly)
2. open output file in firefox

What is the expected behavior? 
The annotations should be visible.
![Bildschirmfoto 2021-04-26 um 09 15 48](https://user-images.githubusercontent.com/33630884/116043809-6a020f80-a670-11eb-973c-6f2df3dae532.png)

What went wrong? 
The annotations are added to the dom but invisible.
![Bildschirmfoto 2021-04-26 um 09 18 26](https://user-images.githubusercontent.com/33630884/116043867-7e460c80-a670-11eb-964d-0cc2c6dbfb61.png)

Tested successfull with FoxitReader, AcrobatReader, Chrome and Safari.
this.color = getRgbColor(color);
  }
  /**
   * Set the border style (as AnnotationBorderStyle object).
   *
   * @public
   * @memberof Annotation
   * @param {Dict} borderStyle - The border style dictionary
   */
  setBorderStyle(borderStyle) {
    if (
      typeof PDFJSDev === "undefined" ||
      PDFJSDev.test("!PRODUCTION || TESTING")
    ) {
      assert(this.rectangle, "setRectangle must have been called previously.");
    }
    this.borderStyle = new AnnotationBorderStyle();
    if (!isDict(borderStyle)) {
      return;
    }
    if (borderStyle.has("BS")) {
      const dict = borderStyle.get("BS");
      const dictType = dict.get("Type");
      if (!dictType || isName(dictType, "Border")) {
        this.borderStyle.setWidth(dict.get("W"), this.rectangle);
        this.borderStyle.setStyle(dict.get("S"));