Mozilla Firefox is a top-notch web browser used by millions of people around the world. Mozilla Firefox, due to its ease of use and aesthetic design is able to compare to the likes of both Google Chrome and Safari. Nonetheless, accessing some features in Mozilla Firefox may be a bit confusing, especially if you’re new to the web browser. For example, the Configuration Editor shows the preferences for Mozilla Firefox, which are read from the prefs.js and user.js files in the Firefox profile and from application defaults. Put simply, these preferences display advanced settings which aren’t available in the usual, simple to access Preferences panel.

The Configuration Editor is also known as the about:config page, and is a lot easier to access than you think. The process to change preferences in Mozilla Firefox through use of the Configuration Editor is easy enough to carry out, and will only require a few moments of your time. In order to get started and access the Configuration Editor in order to change or reset Mozilla Firefox’s preference settings, follow the simple instructions below.

Access Configuration Editor in Mozilla Firefox

Before you get started and learn how to access the Configuration Editor in Firefox, you should keep in mind that when you change the advanced settings you may end up inadvertently end up breaking Firefox or causing some other sort of unusual behavior. You should only change the advanced settings in the Configuration Editor if you’re sure you know what you’re doing, or if you’re following a credible tutorial. In order to get started and access the Configuration Editor in Mozilla Firefox, follow the easy instructions below.

1. Launch Mozilla Firefox, as you normally would.

2. In the address bar, type in about:config.

3. Press the enter/return key.

4. A warning page may appear in the window. If so, click on Accept the Risk and Continue, in order to continue to the about:config page. set preferences in the Firefox profile

5. Click on Show All in order to view all of the currently set preferences in the Firefox profile. You also have the option to use the Search preference name box, in order to filter the list, if you wish to do so.

It’s as simple as that. You’ve now gained access to the advanced settings in Firefox, and can play around and adjust things, as you wish. In order to learn more about how you can do this, follow along below.

Searching Through Preferences

Now that you’ve learned how to access the Configuration Editor, you should learn how to search through preferences, though use of the Search preference name option, described in step #5 of the above tutorial. The process is fairly straightforward. For example, if you’d like to search for the security.OCSP.enabled preference, all you need to do is type in oscp in the Search box.

Please keep in mind that preference names are case sensitive, but search terms aren’t.

Modifying Preference in Mozilla Firefox

Once you’ve located the preference you’d like to modify, the actual modification process is rather simple. If you’re having trouble locating the preference you’d like to modify, read the section above. Modifying your chosen preference will only take a few moments of your time. In order to get started and learn how you can modify a preference in Mozilla Firefox, follow the instructions below.

1. Double-click on a preference in order to change its value, or follow the appropriate step below,

  • For Boolean (true-false) preferences: Click on the Toggle button
  • Got string (text) or number preferences: Click on the Edit button, and enter a new value

2. Click on the blue checkmark, in order to change your modification.

It’s as simple as that. You’ve now modified your chosen preference.

Delete or Reset Preferences

If you thought things couldn’t get any easier, then you’re in for a surprise. The process to reset or delete a preference is very simple, and straightforward. This will only take a few seconds of your time.

Reset button

In order to reset a preference, all you need to do is click on the Reset button. The icon for Reset is a backwards arrow. In order to delete a preference all you need to do is click on the Delete button. The icon for Delete is a trash can. Please note that if you added the preference entry by yourself, then it will no longer be listed once Mozilla Firefox has restarted. You’ll only be able to reset or remove modified preferences. Modified preferences will be in bold text. As you can see the process is very clear cut and straightforward.

Nonetheless, you should always be careful when adjusting such advanced settings on the Configuration Editor for Mozilla Firefox, or else you may cause undue harm to the browser. There’s a reason access to the Configuration Editor isn’t straightforward and simple. This is to prevent users who don’t know what they’re doing from changing something that may break Firefox.