@moongya1 As someone who used Firefox until about 2 months ago, it does not support multiple profiles. You can do a work around like the one zalex108 suggested above and there is an extension that used to let you do it (it doesn't work with newer versions) but the browser itself doesn't give you the option.
Do more on the web, with a fast and secure browser!
Download Opera browser with:
- built-in ad blocker
- battery saver
- free VPN