It appears that the official chrome webstore extension by Rob W is outdated.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

});
  const licenseHeaderLibre = fs
    .readFileSync("./src/license_header_libre.js")
    .toString();
  const enableSourceMaps =
    !bundleDefines.MOZCENTRAL &&
    !bundleDefines.CHROME &&
    !bundleDefines.LIB &&
    !bundleDefines.TESTING &&
    !disableSourceMaps;
  const skipBabel = bundleDefines.SKIP_BABEL;
  
  
  
  const babelExcludes = ["node_modules[\\\\\\/]core-js"];
  if (enableSourceMaps) {
    babelExcludes.push("src[\\\\\\/]core[\\\\\\/](glyphlist|unicode)");
  }
  const babelExcludeRegExp = new RegExp(`(${babelExcludes.join("|")})`);
  const babelPlugins = ["@babel/plugin-transform-modules-commonjs"];
  const plugins = [];
  if (!disableLicenseHeader) {
    plugins.push(
      new webpack2.BannerPlugin({ banner: licenseHeaderLibre, raw: true })
    );
  }
  const experiments =
    output.library?.type === "module" ? { outputModule: true } : undefined;
  
  output.globalObject = "globalThis";