Where Is The Profile Folder?
The profile folder is where all of your unique user settings and addons for Firefox are stored.
Here is where you can find your Firefox Profile Folder:
Windows XP
Example: C:\Documents and Settings\<user name>\Application Data\Mozilla\Firefox\Profiles\<profile folder>
Note: The Application Data folder is a hidden folder; to show hidden folders, open Windows Explorer and choose “Tools → Folder Options → View (tab) → Show hidden files and folders”.
Windows Vista
Example: C:\Users\<user name>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile folder>
The AppData folder is folder is a hidden folder; to show hidden folders, open a Windows Explorer window and choose “Organize → Folder and Search Options → Folder Options → View (tab) → Show hidden files and folders”.
OS X
Example: ~/Library/Mozilla/Firefox/Profiles/<profile folder>
Example: ~/Library/Application Support/Firefox/Profiles/<profile folder>
Note: The tilde character (~) refers to the current user’s Home folder. so ~/Library is the /Macintosh HD/Users/<username>/Library folder.