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)

}
        
        
        forcePostTable = true;
      } else {
        
        
        
        
        
        
        
        
        
        
        for (let i = 0; i < cmapMappingsLength; ++i) {
          let charCode = cmapMappings[i].charCode;
          if (
            cmapPlatformId === 3 &&
            charCode >= 0xf000 &&
            charCode <= 0xf0ff
          ) {
            charCode &= 0xff;
          }
          charCodeToGlyphId[charCode] = cmapMappings[i].glyphId;
        }
      }
      
      if (
        properties.glyphNames &&