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Profile Directory Locations and Files

General Advice: The easiest way to access your profile on Windows is to use the environment variable %appdata%. This works on all versions of Windows.
Start | Run | %appdata% [hit enter]
Windows XP:

In Windows Vista, click on the Start button and type %appdata% in the Start Search box:
a folder named "Roaming" will be displayed. Click on the folder to access the folder.

Windows Vista

Windows Vista uses a folder structure different from previous Windows versions. All personal files andfolders can be found in C:\Users (replace C:\ with the drive Windows is installed on). Documents and Settings (used by previous Windows versions) still exists but only points to C:\Users.

Windows 2000/XP/Server 2003

Note: If you can't find your profile in Windows 2000/XP, make sure you enabled both viewing hidden and system-protected files and folders in your Windows Explorer options.

%USERPROFILE% = usually  C:\Documents and settings\

Mozilla/Netscape 6.x/7.x
%USERPROFILE%\Application Data\Mozilla\Profiles\[Profilname]\[random string].slt\
Beonex: %USERPROFILE%\Application Data\Beonex\Profiles\[Profilname]\[random string].slt\
Firefox: %USERPROFILE%\Application Data\Mozilla\Firefox\Profiles\[Profilname]\[random string].slt\
Thunderbird: %USERPROFILE%\Application Data\Thunderbird\Profiles\[Profilname]\[random string].slt\
Netscape-Browser: %USERPROFILE%\Application Data\Netscape\Profiles\[Profilname]\[random string].slt\
K-Meleon: C:\Program Files\K-Meleon\Profiles

Windows 95/98/ME
Mozilla/Netscape 6.x/7.x: C:\Windows\Application Data\Mozilla\Profiles\[Profilname]\[random string].slt\
C:\Windows\Application Data\Beonex\Profiles\[Profilname]\[random string].slt\
C:\Windows\Application Data\Mozilla\Firefox\Profiles\[Profilname]\[random string].slt\
C:\Windows\Application Data\Thunderbird\Profiles\[Profilname]\[random string].slt\
C:\Windows\Application Data\Netscape\NSAE\Profiles\[random string].[Profilname]\
C:\Program Files\K-Meleon\Profiles

Windows 95/98/Me Family Logon
Mozilla/Netscape 6.x/7.x: C:\Windows\Profiles\%USER%\Application Data\Mozilla\Profiles\[Profilname]\[random string].slt
Beonex: C:\Windows\Profiles\%USER%\Application Data\Beonex\Profiles\[Profilname]\[random string].slt
Firefox: C:\Windows\Profiles\%USER%\Application Data\Mozilla\Firefox\Profiles\[Profilname]\[random string].slt\
Thunderbird: C:\Windows\Profiles\%USER%\Application Data\Thunderbird\Profiles\[Profilname]\[random string].slt\
Netscape-Browser: C:\Windows\Profiles\%USER%\Application Data\Netscape\NSAE\Profiles\[random string].[Profilname]\
K-Meleon: C:\Program Files\K-Meleon\Profiles

Windows NT 4.0
Mozilla/Netscape 6.x/7.x: C:\Winnt\Profiles\%USER%\Application Data\Mozilla\Profiles\[Profilname]\[random string].slt\
Beonex: C:\Winnt\Profiles\%USER%\Application Data\Beonex\Profiles\[Profilname]\[random string].slt\
Firefox: C:\Winnt\Profiles\%USER%\Application Data\Mozilla\Firefox\Profiles\[Profilname]\[random string].slt\
Thunderbird: C:\Winnt\Profiles\%USER%\Application Data\Thunderbird\Profiles\[Profilname]\[random string].slt\
Netscape-Browser: C:\Winnt\Profiles\%USER%\Application Data\Netscape\NSAE\Profiles\[random string].[Profilname]\
K-Meleon: C:\Program Files\K-Meleon\Profiles

Mozilla/Netscape 6.x/7.x ~/.mozilla/[Profilname]/[random string].slt/
Beonex: ~/.beonex/[Profilname]/[random string].slt/
Firefox: ~/.mozilla/firefox/[Profilname]/[random string].slt/
Thunderbird: ~/.thunderbird/[Profilname]/[random string].slt/

Mozilla/Netscape 6.x/7.x ~/Library/Mozilla/Profiles/[Profilname]/[random string].slt/
Beonex: ~/Library/Beonex/Profiles/[Profilname]/[random string].slt/
Firefox: ~/Library/Mozilla/Firefox/Profiles/[Profilname]/[random string].slt/
Thunderbird: ~/Library/Thunderbird/Profiles/[Profilname]/[random string].slt/

Files and Folders in the directory
Main /Mozilla/ folder:

pluginreg.dat Plugin database. Installed plugins on your system.
registry.dat keeps the info where your profile(s) are stored. If this file is missing, Mozilla will not be able to find your configured profiles.
Data in your profile folder:
Datei Beschreibung Details
12345678.s Password-Database Saves all your passwords for Wb/FTP/Email/News. You can easily copy this file from system to system to reuse it. Just alter the prefs.js and change the settings so that the path points to this file. You can delete this file to get rid of all saved passwords.
12345678.w Forms-Database Saves all your forms-data. You can delete this file to get rid of all saved forms data.
abook.mab address book Personal address book
bookmarks.html Bookmarks Contains all your bookmarks. This file can be used in Netscape 4 as well. Just copy the file to your Netscape 4 profile and rename it to "bookmark.htm".
cert7.db /cert8.db certificates database client certificates database. If you have problems with certificates, delete those files. See also key4.db and secmod.db.
cookies.txt Cookies database Contains all your stored cookies. You can delete this file when you encounter problems with cookies and the UI-option doesn't work right.
custom.dic Custom dictionary Words you add to the dictionary are saved in this file.
default-connections.rdf AIM/ICQ settings settings for ICQ/AIM integration
default-invite.rdf AIM/ICQ settings Buddy list for AIM/ICQ
default-messages.rdf settings for AIM default replies for AIM
default-messages-icq.rdf settings for ICQ default replies for ICQ
downloads.rdf Downloadmanager database Contains a list of all downloaded files. Delete this file to get rid of this list.
history.dat History database Contains a database of all visited web pages. You can delete the content via UI, but sometimes it's easier to delete this file. 
history.mab Temporary address book Collected addresses address book. Yu can delete this file to get rid of all the entries in "Collected" Addresses".
key3.db Security key database key database for certificates. If you have problems with certificates delete this file. It will be recreated with default settings. Existing certificates will be deleted though and have to be reinstalled.
localstore.rdf Saves windows positions Saves userdefined windows positions. Can be deleted if you have problems with Mozilla windows.
mailViews.dat Mail and News Views Saves how the Mail and News items are displayed.
mimeTypes.rdf MIME Types Helpers Defines helper applications for MIME-types. See preferences -> Navigator -> helper...
panacea.dat Mail folder cache Cache for the mail folder database, layout.
panels.rdf Sidebar panels Installed panels in the sidebar. To get rid of installed sidebar panels, remove this file, it will be recreated with its default settings.
parent.lock (Linux: .parentlock) Lock-file Created when a profile is in use, so that it can not be started twice.
prefs.js configuration file All configurations such as Mailnews accounts, paths and so forth go into this file.
prefs.bak Backup-file Backup of prefs.js.
search.rdf Search engine file Saves installed/used custom search engines in the sidebar. Can be deleted to get rid of any customization.
secmod.db Security module database security modules database. Delete if you have problems with your security certifcates.
training.dat Training file Training-file for the Bayesian Filter.
URL.tbl forms data exclusion file Saves websites you don't want to have forms data saved.
user.js user configuration file central configuration file for user customizations.
XUL.mfl (Linux: XUL.mfasl) XUL Cache XUL fastload file. Caches the user interface for faster loading.
*.ics Calendar files Saves entries for the calendar.
/Cache Cache-folders Visited pages are saved there.
/NewCache Cache folders for Netscape 6.x Visited pages.
/chrome interface customizations Contains:
*.jar: Installed themes
userChrome.css: interface customizations
userContent.css: content customizations
chrome.rdf: Saves Mozilla Layout (used Themes)
/ImapMail Imap Mail Contains data to your configured IMAP servers
%IMAP-SERVER-NAME%.MSF: account information
%IMAP-SERVER-NAME%-Unterordner: Saved offline data for the account
rules.dat: mail filters
msgFilterRules: New mail filters
*.msf: mail view status, offline file.
/Mail POP3 Mail Contains data to your installed POP3-accounts..
%POP3-SERVER-NAME%-Unterordner: GSaved data for your mail accounts.
*.msf: Index files. Saves status of your emails. These files are known to get corrupted, so delete them if you have problems with Mail.
files without extension: contains your mails in the Unix mbox format.
rules.dat: mail filters.
popstate.dat: POP3 status file.
/News News Server Ordner Contains data to your configured news servers.
%NEWS-SERVER-NAME%.MSF: account information.
%NEWS-SERVER-NAME%.RC: List of subscribed newsgroups.
%NEWS-SERVER-NAME%-folders: Saved data for your groups:
hostinfo.dat: listes known groups in each server
%Gruppenname$.msf: Status, offline file for each group.
%Gruppenname$.dat: News filters.


© Holger Metzger