
Attach (recommended) or Link to PDF file here:
[NAPEN16171380959.pdf](https://github.com/mozilla/pdf.js/files/6143802/NAPEN16171380959.pdf)

Configuration:
- Web browser and its version: Firefox 88 Nightly
- Operating system and its version: Windows 10
- PDF.js version:
- Is a browser extension: No

What went wrong? (add screenshot)
![](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2021-03-15-10-58-27-ce2796.png)


loca,
        glyf,
        numGlyphs,
        isGlyphLocationsLong,
        hintsValid,
        dupFirstEntry,
        maxSizeOfInstructions
      ) {
        var itemSize, itemDecode, itemEncode;
        if (isGlyphLocationsLong) {
          itemSize = 4;
          itemDecode = function fontItemDecodeLong(data, offset) {
            return (
              (data[offset] << 24) |
              (data[offset + 1] << 16) |
              (data[offset + 2] << 8) |
              data[offset + 3]
            );
          };
          itemEncode = function fontItemEncodeLong(data, offset, value) {
            data[offset] = (value >>> 24) & 0xff;