How to use the Responsive Design mode In Web Browsers
Lets visit GFG site and use this mode to check responsiveness of the webpage.
Step 1: Visit the GFG site using firefox and open the mode with or without DevTools according to you use.
Step 2: Change devices and various options and check for responsiveness.
Responsive Design Mode in Mozilla Firefox Browser
All web pages which are design for multiple devices having varying screen width must have a responsive design. These design can have relative layout and/or reflowing content. To inspect the responsive design of a web page Firefox provides a mode for simulating various screen sizes, throttling and touch.