How to test responsive webdesign on Firefox browser (no add-ons)?

What is a responsive web design?
"Responsive web design (RWD) is an approach to web design aimed at crafting sites to provide an optimal viewing experience�easy reading and navigation with a minimum of resizing, panning, and scrolling�across a wide range of devices (from desktop computer monitors to mobile phones)."


How do know if a website is made Responsive?

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