Viewer:  https://mozilla.github.io/pdf.js/web/viewer.html
Chrome on Windows 10
When the attached PDF file is viewed, some of the fonts display as garbled text. 
[Arial, Courier, Times New Roman]
The file views correctly in Adobe Reader.
[fff.pdf](https://github.com/mozilla/pdf.js/files/4652174/fff.pdf)

return;
    }
    
    
    
    [type, subtype] = getFontFileType(file, properties);
    if (type !== this.type || subtype !== this.subtype) {
      info(
        "Inconsistent font file Type/SubType, expected: " +
          `${this.type}/${this.subtype} but found: ${type}/${subtype}.`
      );
    }
    let data;
    try {
      switch (type) {
        case "MMType1":
          info("MMType1 font (" + name + "), falling back to Type1.");
        
        case "Type1":
        case "CIDFontType0":
          this.mimetype = "font/opentype";
          const cff =
            subtype === "Type1C" || subtype === "CIDFontType0C"
              ? new CFFFont(file, properties)
              : new Type1Font(name, file, properties);
          adjustWidths(properties);
          
          data = this.convert(name, cff, properties);
          break;
        case "OpenType":