1  const extensionApi =
2      (typeof browser === 'object' &&
3       typeof browser.runtime === 'object' &&
4       typeof browser.runtime.getManifest === 'function') ? browser
5        : (typeof chrome === 'object' &&
6       typeof chrome.runtime === 'object' &&
7       typeof chrome.runtime.getManifest === 'function') ? chrome
8          : console.log('Cannot find extensionApi under namespace "browser" or "chrome"');