Profiles - Where Firefox stores your bookmarks, passwords and other user data

All of the changes you make in Firefox, like your home page, what toolbars you use, saved passwords and your bookmarks, are all stored in a special folder, called a profile. Your profile folder is stored in a separate place from the Firefox program so that, if something ever goes wrong with Firefox, your information will still be there. It also means you can uninstall Firefox without losing your settings and you don't have to reinstall Firefox to clear your information or troubleshoot a problem.

This information is here for reference. You don't have to follow these steps unless you were directed to do so from another article.

How do I find my profile?

  1. Click the menu button New Fx Menu , click help Help-29 and select Troubleshooting Information. The Troubleshooting Information tab will open.
  2. Under the Application Basics section, click on Show Folder. A window with your profile files will open.
  3. Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.

Finding your profile without opening Firefox

  1. Click the Windows Start button. The Start menu will open.
  2. In the Search box at the bottom of the Start menu, type:
    without pressing Enter. A list of profiles will appear at the top of the Start menu.
  3. Click on the profile folder you wish to open (it will open in a window). If you only have a single profile, its folder would have "default" in the name.

Alternatively, you can find your profile by pressing the Windows Key key and then start typing: %APPDATA%\Mozilla\Firefox\Profiles\

What information is stored in my profile?

Note: Only important information useful for recovering is described.
  • Cookies: A cookie is a bit of information stored on your computer by a website you’ve visited. Usually this is something like your site preferences or login status. Cookies are all stored in the cookies.sqlite file.
  • DOM storage: DOM Storage is designed to provide a larger, more secure, and easier-to-use alternative to storing information in cookies. Information is stored in the webappsstore.sqlite file for websites and in the chromeappsstore.sqlite for about:* pages.
  • Security certificate settings: The cert8.db file stores all your security certificate settings and any SSL certificates you have imported into Firefox.
  • Security device settings: The secmod.db file is the security module database.
  • Download actions: The mimeTypes.rdf file stores your preferences that tell Firefox what to do when it comes across a particular type of file. For example, these are the settings that tell Firefox to open a PDF file with Acrobat Reader when you click on it. For more information, see Change what Firefox does when you click on or download a file.
  • Plugin MIME type: The pluginreg.dat file stores Internet media types related to your installed plugins. For more information, see Use plugins to play audio, video, games and more.
  • Stored session: The sessionstore.js file stores the currently open tabs and windows. For more information, see Restore previous session - Configure when Firefox shows your most recent tabs and windows.
  • User preferences: The prefs.js file stores customized user preference settings, such as changes you make in Firefox Options dialogs. The optional user.js file, if one exists, will override any modified preferences.
  • User styles: If they exist, the \chrome\userChrome.css and \chrome\userContent.css files store user-defined changes to either how Firefox looks, or how certain websites or HTML elements look or act.

Working with profiles

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