format: kFontNameFmtSerif,
          type: "fontname",
          element: "serif",
          fonttype: "serif",
        },
        {
          format: kFontNameFmtSansSerif,
          type: "fontname",
          element: "sans-serif",
          fonttype: "sans-serif",
        },
        {
          format: kFontNameFmtMonospace,
          type: "fontname",
          element: "monospace",
          fonttype: "monospace",
        },
        {
          format: kFontNameListFmtSerif,
          type: "unichar",
          element: null,
          fonttype: "serif",
        },
        {
          format: kFontNameListFmtSansSerif,
          type: "unichar",
          element: null,
          fonttype: "sans-serif",
        },
        {
          format: kFontNameListFmtMonospace,
          type: "unichar",
          element: null,
          fonttype: "monospace",
        },
        {
          format: kFontSizeFmtVariable,
          type: "int",
          element: "sizeVar",
          fonttype: null,
        },
        {
          format: kFontSizeFmtFixed,
          type: "int",
          element: "sizeMono",
          fonttype: null,
        },
        {
          format: kFontMinSizeFmt,
          type: "int",
          element: "minSize",
          fonttype: null,
        },
      ];
      for (var i = 0; i < prefs.length; ++i) {
        var name = prefs[i].format.replace(/%LANG%/, aLanguageGroup);
        var preference = Preferences.get(name);
        if (!preference) {
          preference = Preferences.add({ id: name, type: prefs[i].type });
        }

        if (!prefs[i].element) {
          continue;
        }

        var element = document.getElementById(prefs[i].element);
        if (element) {
          element.setAttribute("preference", preference.id);

          if (prefs[i].fonttype) {
            await FontBuilder.buildFontList(
              aLanguageGroup,
              prefs[i].fonttype,
              element
            );
          }

          preference.setElementValue(element);
        }
      }
    })().catch(console.error);
  },

  readFontLanguageGroup() {
    let languageGroup = Preferences.get("font.language.group").value;
    let rv = undefined;
    if (!languageGroup) {
      languageGroup = Services.locale.fontLanguageGroup;
      rv = languageGroup;
    }
    this._selectLanguageGroup(languageGroup);
    return rv;
  },

  readUseDocumentFonts() {
    var preference = Preferences.get("browser.display.use_document_fonts");
    return preference.value == 1;
  },

  writeUseDocumentFonts() {
    var useDocumentFonts = document.getElementById("useDocumentFonts");
    return useDocumentFonts.checked ? 1 : 0;
  },
};
PK