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:WindowsMozilla
Windows 95 (with Desktop Update)/98/Me
C:WindowsApplication DataMozilla
C:WindowsProfiles<Windows login/user name>Application DataMozilla
Windows NT 4.x
C:WinntProfiles<Windows login/user name>Application DataMozilla
Windows 2000 and XP
C:Documents and Settings<Windows login/user name>Application DataMozilla
Windows Vista
C:Users<Windows login/user name>AppDataRoamingMozilla
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.
