It appears that the official chrome webstore extension by Rob W is outdated.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

createBuildNumber,
    "locale",
    function scriptingChromium() {
      const defines = builder.merge(DEFINES, {
        CHROME: true,
        SKIP_BABEL: false,
      });
      return merge([
        buildDefaultPreferences(defines, "chromium/"),
        createTemporaryScriptingBundle(defines),
      ]);
    },
    function createChromium() {
      console.log();
      console.log("### Building Chromium extension");
      const defines = builder.merge(DEFINES, {
        CHROME: true,
        SKIP_BABEL: false,
      });
      const CHROME_BUILD_DIR = BUILD_DIR + "/chromium/",
        CHROME_BUILD_CONTENT_DIR = CHROME_BUILD_DIR + "/content/";
      const CHROME_WEB_FILES = [
        ...COMMON_WEB_FILES,
        "!web/images/toolbarButton-openFile.svg",
      ];
      
      rimraf.sync(CHROME_BUILD_DIR);
      const version = getVersionJSON().version;
      return merge([
        createMainBundle(defines).pipe(