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Showing content from http://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data below:

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, if something ever goes wrong with Firefox, your data and settings will still be there. It also means that you can uninstall Firefox without losing your personal information and that you don't have to reinstall Firefox to clear your settings or troubleshoot a problem.

How do I find my profile?

You can find your profile location and open it from the Troubleshooting Information (about:support) page:

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

Finding your profile without opening FirefoxFirefox 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: Press +R on the keyboard. A Run dialog will open. Alternatively, you can press the key and use the search box. Type in: %APPDATA%\Mozilla\Firefox\Profiles\ Click OK. A window will open containing profile folders. Open the profile folder you wish. If you only have one profile, its folder would have "default" in the name. The MSIX (Microsoft Store) Firefox version stores its profiles in a different location. To check if you are using this version: Open the Troubleshooting Information page by entering about:support in the Firefox address bar. In the Application Basics section, check the Distribution ID line. If it contains mozilla-MSIX, this means you are using the MSIX (Microsoft Store) Firefox version. To find the profile folder for this version: Press +R on the keyboard. A Run dialog will open. Type in: %LOCALAPPDATA%\Packages\Mozilla.Firefox without pressing Enter. A list of an only folder will appear. Click on the suggested folder. Then add: \LocalCache\Roaming\Mozilla\Firefox\Profiles\ Click OK. A window will open containing profile folders. From the Start Screen, click the Desktop tile. The Desktop view will open. From the Desktop, hover in the lower right-hand corner to access the Charms. Select the charm. The Search sidebar will open. In the search box, type in: %APPDATA%\Mozilla\Firefox\Profiles\ without pressing Enter. A list of profile folders will appear. Click on the profile folder you wish to open (it will open in a window). If you only have one profile, its folder would have "default" in the name. Click the Windows Start button. The Start menu will open. In the Search box at the bottom of the Start menu, type: %APPDATA%\Mozilla\Firefox\Profiles\ without pressing Enter. A list of profiles will appear at the top of the Start menu. 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.

Click the Finder icon in the dock. On the menu bar, click the menu, hold down the option or alt key and select . A window will open containing your Library folder.
Open the Application Support folder, then open the Firefox folder, and then the Profiles folder.
Your profile folder is within this folder. If you only have one profile, its folder would have "default" in the name.

(Ubuntu) Click the menu on the top right of the screen and select . A File Browser window will appear.
Click the menu and select if it isn't already checked.
Double click the folder marked .mozilla.
Double click the folder marked firefox. 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.

Passwords:

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:

search.json.mozlz4
This file stores user-installed search engines. For more information, see Add or remove a search engine in Firefox.

Personal dictionary:

persdict.dat
This file stores any custom words you have added to Firefox's dictionary. For more information, see How do I use the Firefox spell checker?.

Autocomplete history:

formhistory.sqlite
This file remembers what you have searched for in the Firefox search bar and what information you’ve entered into forms on websites. For more information, see Control whether Firefox automatically fills in forms.

Cookies:

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.

Extensions:

extensions
This folder, if it exists, stores files for any extensions you have installed. To learn more about Firefox extensions and other add-ons, see Find and install add-ons to add features to Firefox.

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:

sessionstore.jsonlz4
This 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.

Window positions and dialog settings:

xulstore.json
This file stores the size and position of the main Firefox window and Library window, selected columns in the Library window, and expanded folders in the Bookmarks Sidebar and History Sidebar.

User preferences:

prefs.js
This file stores customized user preference settings, such as changes you make in Firefox Settings dialogs and in customizing toolbars (Customize Firefox controls, buttons and toolbars). The optional user.js file, if one exists, will override any modified preferences.

Containers:

containers.json
This file stores the details of containers used by the Container Tabs feature, including those created by extensions such as Facebook Container.

Working with profiles

Profile Manager - Create, remove or switch Firefox profiles explains how to do things like, create a new profile, set a new default profile, and delete an old profile.
Recover user data missing after Firefox update explains how to use the Profile Manager to switch profiles, if multiple profiles exist.
Back up and restore information in Firefox profiles explains how to back up and restore a profile. It also explains how to move your profile information to a different location on your hard drive or to another computer.
Recover important data from an old profile explains how to copy files to a new profile and includes a list of files that store information useful for recovery.

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