Chrome extension workshop - 定期爬 PTT 文章

• https://developer.chrome.com/extensions/getstarted
• https://developer.chrome.com/extensions/manifest/icons
• https://developer.chrome.com/extensions/alarms
• https://developer.chrome.com/apps/app_codelab_alarms
• https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
• https://developer.chrome.com/extensions/xhr#requesting-permission