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)

} from "./standard_fonts.js";
import {
  getUnicodeForGlyph,
  getUnicodeRangeFor,
  mapSpecialUnicodeValues,
} from "./unicode.js";
import { IdentityToUnicodeMap, ToUnicodeMap } from "./to_unicode_map.js";
import { CFFFont } from "./cff_font.js";
import { FontRendererFactory } from "./font_renderer.js";
import { GlyfTable } from "./glyf.js";
import { IdentityCMap } from "./cmap.js";
import { OpenTypeFileBuilder } from "./opentype_file_builder.js";
import { readUint32 } from "./core_utils.js";
import { Stream } from "./stream.js";
import { Type1Font } from "./type1_font.js";
const PRIVATE_USE_AREAS = [
  [0xe000, 0xf8ff], 
  [0x100000, 0x10fffd], 
];
const PDF_GLYPH_SPACE_UNITS = 1000;
const EXPORT_DATA_PROPERTIES = [
  "ascent",
  "bbox",
  "black",
  "bold",
  "charProcOperatorList",
  "composite",
  "cssFontInfo",
  "data",
  "defaultVMetrics",