[Tip] Reset or Restore About:Config Settings to Default in Mozilla Firefox

 [Tip] Reset or Restore About:Config Settings to Default in Mozilla Firefox


Recently an AskVG reader contacted me and asked the way to reset all default settings in about:config page of Firefox? Actually he installed some 3rd party extensions in Firefox which started causing issues. He also modified many preferences in about:config page as mentioned on various websites claiming to hurry up Firefox which were also causing weird issues while browsing websites. The reader uninstalled the extension but it didn’t fix the difficulty. Since he modified several preferences/flags in about:config page, he didn’t want to reset them one by one manually. He wanted a fast and straightforward thanks to restore all default preferences/settings in about:config page directly.

https://media.askvg.com/articles/images8/Modified_Default_Preferences_Flags_About_Config_Page_Mozilla_Firefox.png

Actually it’s quite easy to reset all modified preferences/flags in about:config page to factory default with none got to restore them one by one manually. Today during this article, I’m getting to share this trick.

If you're also facing issues after modifying preferences in about:config page (such as Firefox is not any longer starting or crashing at startup) and you furthermore may want to reset about:config page in Firefox and need to revive all modified preferences to default, following steps will help you:

First of all, if you don’t know let me tell you. About:Config is a complicated configuration page present in Mozilla Firefox browser which allows users to switch hidden secret preferences/flags which are generally not available in Firefox Options (about:preferences) page. About:Config page is a complicated tool developed for experts in order that they will customize Firefox consistent with their requirements. Most of the days, About:Config page is employed to enable or disable features in Firefox. we've shared many tutorials in past which utilize About:Config page in Firefox.

More Info: [Tip] Access Hidden Secret Advanced Configuration Page in Your browser

Whenever you modify any preference/flag using about:config page in Firefox, it actually stores the preference along side its value in Prefs.js file present within the user profile folder. once you install Firefox, it automatically creates a user profile folder for you to store your preferences, browsing history, bookmarks, passwords, etc.

More Info: All About Mozilla Firefox Profile Folder and Configuration Files

Prefs.js file stores all default and user modified preferences of About:Config page and whenever Firefox launches, it reads this file to load features consistent with the preferences mentioned within the file.

Similar to Prefs.js, there's another enter Firefox called User.js. This file isn't present by default but users can create this file to store their modified preferences. User.js file is employed to override preferences mentioned in Prefs.js file.

To reset all modified preferences/flags in About:Config page, you only got to delete both files Prefs.js and User.js (if present). Once you delete these files, Firefox will restore all preferences/flags in about:config page to default.

Now the question comes, the way to delete these files? Here are the steps:

1. Open Firefox and click on on Firefox Menu (hamburger menu) button and choose Help -> Troubleshooting Information option. you'll also directly open it by typing about:support in addressbar as mentioned here.

2. It’ll open Troubleshooting Information page. Now click on “Open Folder” button given next to “Profile Folder” label.

https://media.askvg.com/articles/images8/Open_Mozilla_Firefox_User_Profile_Folder_Directly.png

It’ll open your Firefox profile folder directly which is typically present in “%appdata%\Mozilla\Firefox\Profiles\” folder.

3. This step is important! Close Firefox. If you don’t close Firefox and delete Prefs.js file, Firefox will restore the file with same values. So close Firefox.

4. Now search for Prefs.js and User.js files in profile folder. By default, you’ll only see Prefs.js file as it’s created by Firefox altogether computers. User.js file must be created manually by the user, so if you didn’t create it manually, you’ll not see it in your Firefox profile folder.

https://media.askvg.com/articles/images8/Reset_Modified_About_Config_Preferences_Flags_Default_Delete_Prefs_JS_File_Mozilla_Firefox.png

PS: Before deleting Prefs.js and User.js files, confirm to require a backup of those files in order that you'll restore them in future if required or if you're not satisfied with the result. to require a backup, copy the files to some secure location like Desktop or a special drive where you'll easily access them.
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