ConfigFox: Easily configure and tweak Firefox about:config settings

All Firefox users are aware of the fact that Firefox being an open source software is customizable to a very good extent – in fact you can control even the minor as well as major functionalities. But to do all this we need to access the ‘about:config’ page on the browser window which I must tell you is very user unfriendly and hard to manage. We have a already taken a look at some of the useful Firefox about:config tweaks, – but a freeware tool called ConfigFox lets you tweak Firefox easily from a simple UI. THis tool lets you manage the unmanageable settings in an efficient and user-friendly way, it brings you all hidden and advanced configurations nicely grouped for ease.

Tool to tweak Firefox about:config settings


For using ConfigFox, of course you need to have Firefox installed on your computer or the program will throw errors. ConfigFox comes with a collection of useful Firefox settings that are disabled by default, all these settings can be modified using the software. The settings include a few from these categories:

  • Startup
  • Auto Updates
  • Privacy
  • Location bar, search, auto suggestions, history
  • Cache
  • SSL, OCSP, Certs, Encryption, http
  • Plugins
  • Media, Camera
  • JavaScript and DOM
  • Leaks, Fingerprinting, security,dev tools
  • Tweaks

The best part of the software is that you can even add a setting of your choice manually but to do that you need to have knowledge about preference strings of Firefox and user.js files created by Firefox. On the first run ConfigFox, would show you the configurations for default profile, you can easily switch profiles by going to ‘File’ and then ‘Open Profile’. You can even create new profiles and run Firefox under those profiles. Profiles come handy when you want different sets of configurations for different activities.

ConfigFox comes with an inbuilt capability of backing up and restoring your data, you can easily export the ‘user.js’ file which is responsible for handling all the configurations. ConfigFox comes with additional three inbuilt tools, namely:

  • Vacuum SQLite databases: clean .sqlite files in your profile folder reducing file size
  • Defrag profile folder: defrag the profile folder for a better performance (HDD only)
  • Backup Profile: compress the whole profile into inside the profile folder

Overall ConfigFox is an outstanding utility with amazing features. It comes with a very good collection of configurations and the ability to manually add configurations never lets you feel out of customization. The UI is nice and easy to operate and the topping of inbuilt features like backup and defrag makes the software worth the download. ConfigFox is a portable utility and requires no installation.

ConfigFox free download

Click here to download ConfigFox for your Windows PC.

Have a look at Configuration Mania and Panel Tweaks for Firefox too.

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Lavish loves to follow up on the latest happenings in technology. He loves to try out new Windows-based software and gadgets and is currently learning JAVA. He loves to develop new software for Windows. Creating a System Restore Point first before installing a new software is always recommended, he feels.


  1. ErnieK

    A few years ago I set the colour on HTTPS sites in the address bar to yellow and this allowed me to see at a glance whether I was on a secure site or not. HTTP sites showed a standard and HTTPS as yellow. This was a very handy tweak in firefox but times have moved on and I have lost the instructions needed to set this on new PC’s. I have searched About:config as well as a search on the net but cannot find the setting I need. Do you have any idea?

  2. Farmers (Mansfield)

    When I try to open the deafult Firefox profile with this, it gives an error message telling me the user.js file found there wasn’t created by ConfigFox (well of course it wasn’t – Firefox created it). It goes on to recommend I move the existing one from there so ConfigFox can create a new one. Closing the message then forces me to try opening the profile again, which just gives me the same error again. So apparently the program is incapable of doing what it says it does – giving me a user-friendly way of editing my settings – and will only work if I replace the existing settings with their provided file. Why would I do that ? The whole idea is to tweak my existing settings, not have it force me to adopt a new set of defaults and start again ….

  3. Pol123

    It’s because you can only have ONE user.jsfile in Firefox profile at time.

    So instead of overwrite the file and of course losing your settings it ask you to move the file so it will be able to create a new one and if you don’t like it you will be able to revert to the old file. 🙂

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