It appears that the official chrome webstore extension by Rob W is outdated. It was last updated in 2019. 

defines,
  output,
  {
    disableVersionInfo = false,
    disableSourceMaps = false,
    disableLicenseHeader = false,
    defaultPreferencesDir = null,
  } = {}
) {
  const versionInfo = !disableVersionInfo
    ? getVersionJSON()
    : { version: 0, commit: 0 };
  const bundleDefines = builder.merge(defines, {
    BUNDLE_VERSION: versionInfo.version,
    BUNDLE_BUILD: versionInfo.commit,
    TESTING:
      defines.TESTING !== undefined
        ? defines.TESTING
        : process.env.TESTING === "true",
    DEFAULT_PREFERENCES: defaultPreferencesDir
      ? getDefaultPreferences(defaultPreferencesDir)
      : {},
    DIALOG_POLYFILL_CSS:
      defines.GENERIC && !defines.SKIP_BABEL ? getDialogPolyfillCSS() : "",