The following pictures depict how you can easily clean up your:
browsing history
automatic form completion (when, for example, you fill in your address in an e-shop or log in to a service and the browser automatically shows you what data you have entered into similar forms in the past)
cookies
active logins (all services and sites to which you are currently logged in via a specific browser, e.g. Gmail, Facebook, AiS2,…)