This is a question we get time and time again, so I thought I would post the full listing for where your profile folder is for Mozilla Firefox based on your operating system of choice…
Windows 95 (without Desktop Update)
C:\Windows\Mozilla
Windows 95 (with Desktop Update)/98/Me
C:\Windows\Application Data\Mozilla\
C:\Windows\Profiles\<Windows login/user name>\Application Data\Mozilla\
Windows NT 4.x
C:\Winnt\Profiles\<Windows login/user name>\Application Data\Mozilla\
Windows 2000 and XP
C:\Documents and Settings\<Windows login/user name>\Application Data\Mozilla\
Windows Vista
C:\Users\<Windows login/user name>\AppData\Roaming\Mozilla\
Unix
~/.mozilla/
Mac OS X
~/Library/Mozilla/
~/Library/Application Support/
This post from the Mozilla Knowledge Base should also help:
http://kb.mozillazine.org/Profile_folder_-_Firefox
Hope that helps you locate your Firefox profile folder. If there is a location I missed, be sure to let me know and I will get it added.
