import 'unicorn.log'; import browser from 'webextension-polyfill'; browser.runtime.onInstalled.addListener(() => { // eslint-disable-next-line no-console console.unicorn('onInstalled....'); }); browser.runtime.onMessage.addListener((_request, _sender, _sendResponse) => { // Do something with the message! // alert(request.url); // And respond back to the sender. return Promise.resolve('got your message, thanks!'); });