message: import escape instead of using global
diff: import browser from "webextension-polyfill";
  import { selenium } from "./commands-api";
  +import { escapeHTML } from "./escape";
  const bot = window.bot;
  const BrowserBot = window.BrowserBot;
  const goog = window.goog;
  const core = window.core;
  -const escapeHTML = window.escapeHTML;
  // TODO: utils
  const eval_css = window.eval_css;
  