(1) Use Chrome Browser
- Click on f12 or right click on the screen and choose “Inspect element” option
- Click on settings button on right bottom corner
- Click on Overrides tab
- Check “user agent” and “Device metrics” checkboxes

(2) User FireFox Browser
- Click on Tools-> Default User Agents->Edit user agent
- Window will open: Select New-> New user Agent: click on it
- Click on import button and upload xml file with all known user agents