From MozillaZine Knowledge Base

This article will help you recover a missing Firefox or Thunderbird profile in cases where a profile folder containing your missing data still exists but you can no longer access it from the Profile Manager. These instructions do not apply to Mozilla Suite/SeaMonkey 1.x.

Important: If only certain profile data or settings are missing but not other data, then this article does not apply to you. For example:

• If your Firefox bookmarks or toolbar customizations are missing but your installed extensions are still visible in the "Tools -> Add-ons" window, read Lost bookmarks or Corrupt localstore.rdf.
• If you start Thunderbird, see the Account Wizard "New Account Setup" dialog and all your mail and account settings are missing but your personal address book is still intact, read Recovering a profile that suddenly disappeared.

Missing profiles

Mozilla applications store your user data and settings such as bookmarks, passwords, cookies, mail, and address books in a profile folder. In some cases, you may start your Mozilla application and all of your data and settings are missing. This is usually caused by switching to a different profile without realizing it and you can simply start the Profile Manager and select another profile to get back the missing data.

If you use the Profile Manager to delete a profile and choose the Don't Delete Files option, the deleted profile is removed from the list of available profiles but the associated profile folder containing your user data files will remain in place, although no longer used. For example, if you deleted a profile named "firefox" and you used the "Don't Delete Files" option, your user profile data would still be inside the "xxxxxxxx.firefox" profile folder (where "xxxxxxxx" represents a random series of eight characters), although that profile no longer appears in the Profile Manager.

Firefox or Thunderbird may also lose track of an existing profile, in some rare cases. This can happen if the profiles.ini file is missing or damaged because the information stored in that file keeps track of profile names and folder locations. If the profiles.ini file is deleted, Firefox or Thunderbird will automatically create a new profiles.ini file and a new, empty "default" profile. Any additional profiles you may have created will no longer be listed in the Profile Manager and the new "default" profile will be missing your original user profile data. For example, you may only see a single "default" profile listed in the Profile Manager but your profile data is missing and the Firefox or Thunderbird profile folder location now includes two "xxxxxxxx.default" profile folders.

Profile recovery

Using the Profile Manager to recover a profile

If another profile folder exists with data you want to recover, you can use the Profile Manager to create a new profile that will use the profile folder containing your missing data. You do this by using the "Choose Folder..." option in the "Create Profile Wizard" and then browsing to and selecting that folder. If the folder that contains your missing profile data is in the default location, it will have a name similar to "xxxxxxxx.profilename"; for example, your original profile folder might be named "abcdefgh.default". If you have more than one profile folder named ".default" you will need to find out which one contains your missing profile data by checking the contents. (You can also use the - profile <path> command line argument to start Firefox or Thunderbird with the profile, as explained here.)

To recover the missing profile using the Profile Manager, follow these instructions:

1. Close Firefox or Thunderbird completely
2. Start the Profile Manager. A "Choose User Profile" dialog will open.
3. Click on "Create Profile..." and, in the dialog that opens, enter a descriptive name for the profile you are recovering.
4. Click on the "Choose Folder..." button. A "Browse for Folder" dialog will open.
5. Select the profile folder that contains the user data you wish to recover and click OK.
6. Review the path shown in the "Create Profile Wizard" dialog to make sure it is correct, then click "Finish" (or "Done" on Mac OS) to create the new profile.
7. The new profile containing your recovered data will now appear in the Choose User Profile list.

Select the new profile and start Firefox or Thunderbird to verify that your profile data was successfully recovered.

Editing the profiles.ini file - Advanced

Instead of using the above instructions to recover a missing profile, advanced users can edit the profiles.ini file to show the path to the profile folder that contains the missing profile data. Caution: Incorrect editing of the "profiles.ini" file can cause a Firefox or Thunderbird "already running but is not responding" error if the profile cannot be found (bug 278860).

Transferring your profile data

Instead of using either of the above instructions, you may prefer to manually copy your missing profile data to your current profile or to a new profile. See Transferring data to a new profile.

See also

• Moving your profile folder