Create a shortcut of firefox.exe anywhere you like. You can just copy and paste the Firefox shortcut on your desktop. Then right click - properties - modify "Target".
The default value of "target' is the full path of firefox.exe. Usually it's something like this:
"D:\Program Files\Mozilla Firefox\firefox.exe"Add some command line arguments after the full path, so it looks like this:
"D:\Program Files\Mozilla Firefox\firefox.exe" -no-remote -P "YourProfileName"The first time you run this shortcut the Profile Manager will come up. Just create a new profile with exactly the same name as written in your shortcut, and you're done!
Whenever you click on this shortcut, the new Firefox window opened will be completely separate from your original Firefox instance. Different set of cookies, bookmarks, settings, addons, etc.