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

All of the changes you make in Firefox, such as your home page, what toolbars you use, extensions you have installed, saved passwords and your bookmarks, are 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 that you can uninstall Firefox without losing your settings and you don't have to reinstall Firefox to clear your information or troubleshoot a problem.

How do I find my profile?

  • Click the menu button Fx89menuButton, click Help and select Troubleshooting InformationMore Troubleshooting Information.From the Help menu, select Troubleshooting InformationMore Troubleshooting Information. The Troubleshooting Information tab will open.
  • Under the Application Basics section next to Profile FolderDirectory, click Open FolderShow in FinderOpen Directory. A window will open that contains your profile folder.Your profile folder will open.
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

Firefox stores your profile folder in this location on your computer by default:
C:\Users\<your Windows login username>\AppData\Roaming\Mozilla\Firefox\Profiles\

Windows hides the AppData folder by default but you can find your profile folder as follows:

  1. Press Windows Key+R on the keyboard. A Run dialog will open.
  2. Type in:
  3. Click OK. A window will open containing profile folders.
  4. Double-click the profile folder you wish to open. If you only have one profile, its folder would have "default" in the name.
Note: To set Windows to show the AppData folder and other hidden files and folders, see Show hidden files - Windows Help.
  1. Click the Finder icon in the dock. On the menu bar, click the Go menu, hold down the Option or Alt key and select Library. A window will open containing your Library folder.
  2. Open the Application Support folder, then open the Firefox folder, and then the Profiles folder.
  3. Your profile folder is within this folder. If you only have one profile, its folder would have "default" in the name.
  1. (Ubuntu) Click the Places menu on the top right of the screen and select Home Folder. A File Browser window will appear.
  2. Click the View menu and select Show Hidden Files if it isn't already checked.
  3. Double click the folder marked .mozilla, and then the folder marked firefox.
  4. Your profile folder is within this folder. If you only have one profile, its folder would have "default" in the name.

What information is stored in my profile?

Note: This is not a complete list. Only important information is described.

Bookmarks, Downloads and Browsing History:

  • places.sqlite
    This file contains all your Firefox bookmarks and lists of all the files you've downloaded and websites you’ve visited.
  • bookmarkbackups
    This folder stores bookmark backup files, which can be used to restore your bookmarks.
  • favicons.sqlite
    This file contains all of the favicons for your Firefox bookmarks.

For more information, see Bookmarks in Firefox and Restore bookmarks from backup or move them to another computer.


  • key4.db
  • logins.json

Your passwords are stored in these two files. For more information, see Password Manager - Remember, delete and edit logins and passwords in Firefox.

Site-specific preferences:

  • permissions.sqlite
  • content-prefs.sqlite

These two files store many of your Firefox permissions (for instance, which sites are allowed to display popups) or zoom levels that are set on a site-by-site basis (see Font size and zoom - increase the size of web pages).

Search engines:

Personal dictionary:

Autocomplete history:


  • cookies.sqlite
    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 this file.

DOM storage:

DOM Storage is designed to provide a larger, more secure, and easier-to-use alternative to storing information in cookies.

  • webappsstore.sqlite
    Information is stored in this file for websites.
  • chromeappsstore.sqlite
    This file stores information for about:* pages.


Security certificate settings:

  • cert9.db
    This file stores all your security certificate settings and any SSL certificates you have imported into Firefox.

Security device settings:

  • pkcs11.txt
    This file stores security module configuration.

Download actions:

  • handlers.json
    This 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 Manage file types and download actions in Firefox.

Stored session:

Toolbar customization:

User preferences:

  • prefs.js
    This file stores customized user preference settings, such as changes you make in Firefox OptionsPreferencesSettings dialogs. The optional user.js file, if one exists, will override any modified preferences.


Working with profiles

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