how to make profile in firefox

How to create firefox profile?
some of people get confuse how to diferse between public profile and private profile in their pc, yes especially if your computer are usually borrowed by some one.you don't want session in your firefox browser were deleted or your account accessed by your friend.
firefox give your way to make some of profile in one pc and one installation here is it.

Important: Before you can start the Profile Manager, Firefox must be completely closed.

At the top of the Firefox window, click on the Firefox button (File menu in Windows XP) and then click Exit.
Open the Windows Start menu.
Windows 7 and Vista: In the Search box at the bottom left of the Windows Start menu, type:
firefox.exe -ProfileManager
Windows XP and 2000: In the Windows Start menu, click Run... and, in the Run dialog, type:
firefox.exe -ProfileManager
Press Enter (Windows 7 and Vista) or click OK (Windows XP and 2000)

Note: If the Profile Manager window does not appear, you may need to specify the full path of the Firefox program, enclosed in quotes; for example:
"C:\Program Files\Mozilla Firefox\firefox.exe" -ProfileManager

firefox profile manager

If the Profile Manager window does not open, Firefox may have been running in the background, even though it was not visible. Close all instances of Firefox or restart the computer and then try again.