It appears that the official chrome webstore extension by Rob W is outdated.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

/* Copyright 2016 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
"use strict";
const autoprefixer = require("autoprefixer");
const postcssDirPseudoClass = require("postcss-dir-pseudo-class");
const postcssLogical = require("postcss-logical");
const fs = require("fs");