code: function fallBack () {
        var programFilesVar = "ProgramFiles";
        if (arch === "(64)") {
          console.warn("You are using 32-bit version of Firefox on 64-bit versions of the Windows.\nSome features may not work correctly in this version. You should upgrade Firefox to the latest 64-bit version now!")
          programFilesVar = "ProgramFiles(x86)";
        }
        resolve(path.join(process.env[programFilesVar], appName, "firefox.exe"));
      }
docs: this is used when reading the registry goes wrong.