Attach (recommended) or Link to PDF file here:
See pdf in https://github.com/mozilla/pdf.js/issues/3109

Configuration:
- Web browser and its version: Firefox nightly
- Operating system and its version: Windows 10
- PDF.js version: builtin viewer

Steps to reproduce the problem:
1. Look at outlines

What is the expected behavior? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/141514798-0e656865-1cbf-4fb8-a89b-530d36da23c9.png)

What went wrong? (add screenshot)
![image](https://user-images.githubusercontent.com/5641725/141514740-c95e0237-8bf4-4129-a4a5-cb2ea5a3f4df.png)

isString,
  MissingPDFException,
  objectFromMap,
  objectSize,
  OPS,
  PageActionEventType,
  PasswordException,
  PasswordResponses,
  PermissionFlag,
  removeNullCharacters,
  RenderingIntentFlag,
  setVerbosityLevel,
  shadow,
  StreamType,
  string32,
  stringToBytes,
  stringToPDFString,
  stringToUTF16BEString,
  stringToUTF8String,
  TextRenderingMode,
  UnexpectedResponseException,
  UnknownErrorException,
  unreachable,
  UNSUPPORTED_FEATURES,
  utf8StringToString,
  Util,
  VerbosityLevel,
  warn,
};