Runtime Directories

Default Application Installation and User Profile Directories

Firefox

OS	Application Directory	User Profile Directory	Temporary Directory
Windows Vista/7	C:\Program Files\Mozilla Firefox\	C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\ (or %APPDATA%\Mozilla\Firefox\)	C:\Users\<username>\AppData\Local\Mozilla\Firefox\ (or %LOCALAPPDATA%\Mozilla\Firefox) and C:\Users\<username>\AppData\Local\VirtualStore\Program Files\Mozilla Firefox\
Windows 2000/XP	C:\Program Files\Mozilla Firefox\	C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\ (or %APPDATA%\Mozilla\Firefox\)	C:\Documents and Settings\<username>\Local Settings\Application Data\Mozilla\Firefox\
OS X	/Applications/Firefox.app	~/Library/Application Support/Firefox/Profiles/xxxxxxxx.default/	~/Library/Caches/Firefox/Profiles/xxxxxxxx.default/
Linux	????	~/.mozilla/firefox/xxxxxxxx.default/	n/d

Thunderbird

OS	Application Directory	User Profile Directory	Temporary Directory
Windows Vista/7	C:\Program Files\Mozilla Thunderbird\	C:\Users\<username>\AppData\Roaming\Thunderbird\ (or %APPDATA%\Thunderbird\)	C:\Users\<username>\AppData\Local\Thunderbird\ (or %LOCALAPPDATA%\Thunderbird\) and C:\Users\<username>\AppData\Local\VirtualStore\Program Files\Mozilla Thunderbird\
Windows 2000/XP	C:\Program Files\Mozilla Thunderbird\	C:\Documents and Settings\<username>\Application Data\Thunderbird\ (or %APPDATA%\Thunderbird\)	C:\Documents and Settings\<username>\Local Settings\Application Data\Thunderbird\
OS X	/Applications/Thunderbird.app	~/Library/Thunderbird/Profiles/xxxxxxxx.default/	~/Library/Caches/Thunderbird/Profiles/xxxxxxxx.default/
Linux	????	~/.thunderbird/xxxxxxxx.default/ (or ~/.mozilla-thunderbird/xxxxxxxx.default/ on Debian/Ubuntu)	n/d

See also

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data#w_how-do-i-find-my-profile
• https://support.mozilla.org/en-US/kb/profiles-tb#w_where-is-my-profile-stored
• https://kb.mozillazine.org/Profile_folder