It appears that the official chrome webstore extension by Rob W is outdated.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

const fitCurveOutputName = "fit_curve.js";
  const fitCurveFileConfig = createWebpackConfig(
    defines,
    {
      filename: fitCurveOutputName,
      library: {
        type: "module",
      },
    },
    {
      disableVersionInfo: true,
    }
  );
  return gulp
    .src("src/display/editor/fit_curve.js")
    .pipe(webpack2Stream(fitCurveFileConfig));
}
function createCMapBundle() {