Creating and using multiple profiles on firefox

Task 1 : Create multiple profile

Press Windows Key + R to open Run dialog and type the following command
 firefox.exe -ProfileManager

Now you can create profiles according to requirement. I have 2 profiles
1. Work
2. Personal
 

Task 2: Using Profile

Press Windows Key + R to open Run dialog and type the following command
firefox.exe -ProfileManager -no-remote

Select the profile you want to use.

Let me know if you face any issues. Comment if it helped you. :)