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How to Back-up FireFox Settings


How to Back-up FireFox Settings

Firefox has a config file which can be accessed by typing about:Config in the url section. This file is similar to Windows registry file as it contains information on the running of Firefox.


The config file contains lots of information which the users can change apart from the default value. But changing this value can also be dangerous in the sense that it can sometimes cause Firefox to stop working. So its better to take a backup of the settings file, so that in case you change any value and any error occurs, you can always restore Firefox back to normal state.

How to take the back-up: Taking a back up is simple process. Select Run in Windows and type %appdata%\mozilla\firefox\profiles. It shows a Windows folder which contains a folder which has a name like ati9z0wb.default (the name may not be same in all computers). Open the folder and then copy the file prefs.js to a safe location.

Firefox settings

Should you mess something up in about:config file, simply close Firefox and copy the backup of prefs.js back to its original location.

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Nirmal is a Technology Blogger and a Microsoft MVP in Windows. He can be contacted at You can find Nirmal on , and .



  1. Venkat

    December 7, 2007 at 10:22 am

    Nice trick, easy way to backup firefox settings.Does it also backup the plugins??

  2. nirmaltv

    December 7, 2007 at 10:40 am

    I think this wont backup plugins and themes, for that you need to back up your profile folder.

  3. Keith Dsouza

    December 7, 2007 at 10:55 am

    Have you tried Firefox Environment and Backup Extension it goes much beyond using manual intervention.

    You can download the extension from here

  4. Silki Garg

    December 7, 2007 at 11:11 am

    I also prefer to use the extension mentioned by Keith.

  5. nirmaltv

    December 7, 2007 at 11:20 am

    I have not used this extension as I dont want to increase the memory load on Firefox. But Will try it out.

  6. Raj

    December 7, 2007 at 11:33 am

    Nice trick Nirmal. BTW am using the FF Extension for Backups

  7. Keith Dsouza

    December 7, 2007 at 12:04 pm

    Well it does not increase memory Nirmal this is a per use extension so you will only use memory when the extension is used.

  8. nirmaltv

    December 7, 2007 at 12:20 pm

    Thanks for that info, based on your recommendation, I have installed it, just going through the settings. 🙂

  9. Haris

    December 7, 2007 at 9:49 pm

    Never knew about this prefs.js file. Thanks for sharing it buddy.
    BTW, I once did a small review on FEBE. You can find that on my blog 🙂

  10. ram

    December 8, 2007 at 4:12 am

    never tried this before, i will that addon mentined by keith

  11. nirmaltv

    December 9, 2007 at 4:01 pm

    This Pref.js is important file for FX.

  12. TechPavan

    April 9, 2008 at 12:21 pm

    Few times, comments help the most than article. I came here to read the article but got an easy solution in the comments section. Thanks Nirmal and Keith.

  13. V

    May 19, 2008 at 9:16 pm

    Can you recommend a tool to manage bookmarks.
    Something with a good interface, so I can edit group, rename etc…

    I have so very many bookmarks cluttered all over 🙂

    nice website btw… in our company we refer to your site often from the US!!

  14. Pingback: How to Back-up FireFox Settings | Bloggorama

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