It appears that the official chrome webstore extension by Rob W is outdated.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

process.env.TESTING = "true";
  
  
  
  process.env.TZ = "UTC";
  done();
}
gulp.task("dev-fitCurve", function createDevFitCurve() {
  console.log();
  console.log("### Building development fitCurve");
  const defines = builder.merge(DEFINES, { GENERIC: true, TESTING: true });
  const fitCurveDir = BUILD_DIR + "dev-fitCurve/";
  rimraf.sync(fitCurveDir);
  return createFitCurveBundle(defines).pipe(gulp.dest(fitCurveDir));
});
gulp.task(
  "test",
  gulp.series(
    setTestEnv,
    "generic",
    "components",
    "dev-fitCurve",