Determine what data was deleted. Using this method, you can restore deleted search engines and settings for sites and downloads. Remember that passwords, bookmarks, list of visited sites and cookies will be restored automatically; if this does not happen, you can recover this data using the method described here.

• Add-ons and other settings must be restored manually. Do not restore data from backups as this will likely cause the problem to reoccur.

Open the Troubleshooting Information page. To do this, enter about:support in the address bar of your browser or press ≡ – ? – Problem Solving Information.

Open your profile data contained in a specific folder. To do this, click on the button at the top of the page. Depending on your operating system and browser version, this button will be called as follows:

• On Windows, click Open Folder
• On Mac OS, click “Open in Folder.”
• On Linux, click Open Directory.
• In Firefox 13 and earlier versions of this browser (on any operating system), click "Open the folder containing files."

Find the data you want to recover. Before resetting settings and add-ons, user data is saved in a folder on the desktop. If there is no corresponding folder on your desktop, find the "Old Firefox Data" folder on your computer.

• On Windows, you may have to show hidden files and folders.

Close Firefox. This is the only way you will be able to make changes to your profile settings.

Copy the necessary files to your current profile. To do this, open the “Old Firefox Data” folder and select the appropriate files (read on to learn how to select the correct files). Right-click on the selected files and select Copy. Open your profile folder. Right-click on the empty space in this folder and select Paste.

• On Mac OS, hold Ctrl and select files with the right mouse button.
• If a window opens on the screen, select the “Overwrite existing files” option in it.

Select the files you need. It is better to copy as few files as possible to the new profile to reduce the likelihood of the problem occurring again. The following is a list of files that can be copied.

• Search engines are in the search.json file.
• Site settings (saving cookies, launching pop-ups, etc.) are located in the permissions.sqlite file.
• Download settings (that is, the list of programs responsible for opening certain downloaded files) are located in the mimeTypes.rdf file.
• The data below will be restored automatically. But if the browser reset process fails, restore this data manually.
• Bookmarks and browsing history are stored in the places.sqlite file.
• Passwords are stored in key3.db files And logins.json.
• Data for autofilling forms is stored in the formhistory.sqlite file.

One of the many benefits of the Firefox browser is its many varied and customizable extensions, such as visual themes and additional toolbar options. Browser settings are located in the profile, which stores installed plugins, bookmarks, toolbars and much more. Sometimes you have to face situations when you need to return to the previous configuration to speed up the browser, or restore its default settings. You can save a browser profile to ensure your browser settings are optimal.

Steps

How to restore default settings

Open the page You can restore Firefox settings to default; however, your browsing history, open tabs/windows, passwords, cookies, and autofill data will not be deleted. To restore the default settings, go to the Troubleshooting Information page. This can be done in two ways.

• Click the ☰ icon located in the upper right corner of the browser window, and then click � > Troubleshooting Information.
• Open the menu bar. To do this, right-click on an empty space in the tab bar and select Menu Bar. Now click Help > Troubleshooting Information.

1. Restore Firefox settings. On the Troubleshooting Information page, click Clean up Firefox. In this case, the extensions will be removed and the default settings will be restored. Click Clean Firefox to start the repair process.

   Restart Firefox. A message will appear on the screen indicating that the profile was successfully imported. Click Finish; Firefox will import the saved profile configuration and launch with default settings.

How to delete a settings file

The settings file contains Firefox settings such as the start page, tab settings, and more. If your browser doesn't open web pages as expected, restore the default settings. To do this, open the folder with your profile. This can be done on the Troubleshooting Information page. Open the page using one of the following methods.

• Click the ☰ icon located in the upper right corner of the browser window, and then click � > Troubleshooting Information.
• Open the menu bar. To do this, right-click on an empty space in the tab bar and select Menu Bar. Now click Help > Troubleshooting Information.

1. Under Application Details, click Open Folder; The folder with the profile files will open. Close all open Firefox windows.

   Delete the settings file. Find the "prefs.js" file and then either rename or delete it.

   • Remove or rename additional settings files such as "prefs.js.moztmp" or "user.js".

2. Launch Firefox and close the profile files folder. Firefox will automatically create a new settings file for your profile.

How to manually back up and restore your profile

Open the Troubleshooting Information page. If you create a manual backup, you can save your Firefox profile settings. Restore a backup in case the profile was corrupted, Firefox was reinstalled, or to use Firefox with your settings on another computer. This method will allow you to include browser extensions and other items in your backup that are not included in automatic backups. First, open your profile folder. This can be done on the Troubleshooting Information page. Open the page using one of the following methods.

• Click the ☰ icon located in the upper right corner of the browser window, and then click � > Troubleshooting Information.
• Open the menu bar. To do this, right-click on an empty space in the tab bar and select Menu Bar. Now click Help > Troubleshooting Information.

1. Open your profile folder. It stores the active profile settings. In the Application Details section, click Open Folder; The folder with the active profile files will open in a new Explorer window. In the address bar of the Explorer window, click "Profiles" to go to a list of folders for all Firefox profiles. Double-click the profile folder you want to back up.

2. Create a backup copy of your profile folder. Select all subfolders and files that are stored in the profile folder; To do this, press Ctrl + A. To select only certain subfolders and files, hold down the left mouse button and drag the mouse pointer over the desired subfolders and files. Copy the selected items and paste them into another folder; Designate this folder as a backup of your Firefox profile. Now in the profile folder, delete the subfolders and files to restore Firefox settings when it is launched. Don't delete the parent folder; otherwise you will have to create a new profile.

   • Copy the backup to any folder on your computer or to an external storage device such as a USB drive.
3. A new profile will be created and then the profile window will open; copy the items from the backup folder into it. Restart Firefox for the changes to take effect.
   • On Mac OS X, open a terminal and type "firefox --ProfileManager" (without the quotes) to open the Profile Manager.
   • On Windows, click ⊞ Win + R to open the Run window. Then type "firefox.exe -ProfileManager" (without the quotes) to open the Profile Manager.
   • On Linux, open a terminal, type "cd<путь к папке Firefox>", and then type "/firefox –profilemanager" (without the quotes in both cases) to open the Profile Manager.

• Run Firefox in Safe Mode to see if problems are caused by extensions. There are two ways to launch the browser in safe mode. Method one: Open the menu bar by right-clicking on an empty space in the tab bar and selecting “Menu Bar”; then click Help > Restart Without Add-ons. Second method: click on the ☰ icon and click “�” > “Restart without add-ons”; in the window that opens, click “Restart”. Firefox will restart in Safe Mode. If the browser works fine, the problem is most likely related to one of the extensions. In this case, disable unnecessary extensions in Safe Mode.
• Disable plugins to see how this affects browser performance. Open the Firefox menu and click "Add-ons"; The Manage Add-ons page will open. In this window, click "Plugins". From the menu to the right of each plugin, select Never Enable. If the browser speed increases, enable the plugins one by one to find the faulty plugin.
• If the problem is caused by a Firefox program file, reinstall Firefox on your computer.

The main purpose of resetting Firefox is to get rid of additional applications and themes. After all, it is they, in most cases, that lead to failures in the search engine. Currently, many extensions are outdated and do not work correctly, some of them do not work at all in .

Reset Firefox settings

Resetting Mozilla Firefox settings in most cases helps relieve the browser from malfunctions. There are two ways to return to the original version with parameters from the developers from Mozilla Corporation. The first way is to use the hint contained in the settings menu in the “Information for solving problems” item. The second is to delete the special Jscript script file from the Mozilla Firefox service folder on your personal computer. In both cases, the settings are restored to the default settings without affecting data such as:

• Personal data for automatic filling (logins and passwords);
• Opened and saved bookmarks, history of previously visited web resources and download history;
• Cookies;

The first option is through Help

In the search engine settings menu, you must click on the “Open Help menu” icon. Next, select an item with detailed technical information about useful solutions to problems with the search engine.

First, you can try restarting the browser in safe mode with additional extensions temporarily disabled. If these manipulations are of little benefit, you can try to thoroughly clean it.

The second option is to delete the configuration files

Open the profile folder, and close the browser itself through the settings menu by clicking on the “Exit Firefox” button. This button is next to the Open Help menu button.

In the profile folder that opens, find the “prefs” files. You can keep the JScript file (just in case) only by renaming it. This way, the user will have a backup to restore the settings. And the rest can simply be deleted.

After deleting these files or renaming them, launch the browser. The JScript script file will be created again in the profile folder, and the settings in the Internet browser will return to the “factory” ones.

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This feature is available on Firefox for desktop or laptop computers.

If you"re having problems with Firefox, refreshing it can help. The refresh feature fixes many issues by restoring Firefox to its default state while saving your essential information like bookmarks, passwords, and open tabs.

Important: Since Firefox will revert to its original state, your own configurations and customizations, including extensions , extension data, and about:config preference configurations are removed. If you"ve made accessibility configurations, you may need to change them back after refreshing.

Refresh Firefox

What does the refresh feature do?

All of your Firefox settings and personal information are stored in a . The refresh feature works by creating a new profile folder for you while saving your important data.

Add-ons which are normally stored inside the Firefox profile folder, such as extensions and themes, will be removed. Add-ons stored in other locations will not be removed but any modified preferences will be reset.

Firefox will save these items:

• Bookmarks
• Browsing and download history
• Passwords
• Open windows and tabs
• Cookies
• Web form auto-fill information
• Personal dictionary

These items and settings will be removed:

• Website permissions
• Modified preferences
• DOM storage
• Security certificate and device settings
• User styles (chrome subfolder containing userChrome and/or userContent CSS files , if previously created.)

Note: Your old Firefox profile will be placed on your desktop in a folder named "Old Firefox Data". If the refresh didn't fix your problem you can restore some of the information not saved by copying files to the new profile that was created. If you don't need this folder any longer, you should delete it as it contains sensitive information.

This article, like all Firefox support, is brought to you mostly by volunteers, who keep Mozilla proudly independent and open source. Keep browsing freely!

//

This feature is available on Firefox for desktop or laptop computers.

If you"re having problems with Firefox, refreshing it can help. The refresh feature fixes many issues by restoring Firefox to its default state while saving your essential information like bookmarks, passwords, and open tabs.

Important: Since Firefox will revert to its original state, your own configurations and customizations, including extensions , extension data, and about:config preference configurations are removed. If you"ve made accessibility configurations, you may need to change them back after refreshing.

Refresh Firefox

What does the refresh feature do?

All of your Firefox settings and personal information are stored in a . The refresh feature works by creating a new profile folder for you while saving your important data.

Add-ons which are normally stored inside the Firefox profile folder, such as extensions and themes, will be removed. Add-ons stored in other locations will not be removed but any modified preferences will be reset.

Firefox will save these items:

• Bookmarks
• Browsing and download history
• Passwords
• Open windows and tabs
• Cookies
• Web form auto-fill information
• Personal dictionary

These items and settings will be removed:

• Website permissions
• Modified preferences
• DOM storage
• Security certificate and device settings
• User styles (chrome subfolder containing userChrome and/or userContent CSS files , if previously created.)

Note: Your old Firefox profile will be placed on your desktop in a folder named "Old Firefox Data". If the refresh didn't fix your problem you can restore some of the information not saved by copying files to the new profile that was created. If you don't need this folder any longer, you should delete it as it contains sensitive information.

This article, like all Firefox support, is brought to you mostly by volunteers, who keep Mozilla proudly independent and open source. Keep browsing freely!

// These fine people helped write this article: