Do you want to know what technologies (CMS, frameworks, platforms) are used on website?
Check out wappalyzer and its Chrome extension. Easy way to detect the environment used behind the website.
Password Checkup extension by Google: A must have Chrome extension to get alert if your username and password for wherever you sign-in is no longer safe due to appearing in a data breach. It helps you resecure accounts that were affected by data breaches.