How to clear cache and cookies in Mozilla firefox web browsers (quickly)

Mozilla firefox is a most popular web browser. Lot of web developers  and end users are using this web browser for their day-to day works. Due to some reasons, we want to clear browser cache, cookies, browsing and downloading history, active logins and forms and login history. But, on that time we may face difficulties when try to find the way. This article is written for giving a small support to seekers.
To do this thing, open your Mozilla web browser and press ctrl + shift + delete key combinations. Then you will find a small windows like below image.

After that you can select the desired things and press "clear now" button.  :)