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Showing content from https://support.mozilla.org/en-US/kb/configuration-editor-for-firefox below:

Configuration Editor for Firefox | Firefox Help

The Configuration Editor (about:config Advanced Preferences page) lists Firefox settings known as preferences that are read from the prefs.js and user.js files in the Firefox profile and from application defaults. Many of these preferences are advanced settings that are not present in the Settings panel. This article describes how to use the about:config page to view, change, or reset Firefox preference settings, if you need to do so.

Warning:

These instructions are for experienced Firefox users. Changing settings in the

Configuration Editor

(

about:config

) can have serious effects on your browser’s stability, security and performance.

Only proceed if you are comfortable with advanced settings and understand the potential impacts

Opening the about:config page

Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click Accept the Risk and Continue to go to the about:config page. Click Show All to view all preferences currently set in the profile or use the Search preference name box to filter the list.

Searching for preferences You can use the Search preference name box at the top of the about:config page to quickly find specific preferences. For example, if you enter ocsp in the Search box, it will bring up the security.OCSP.enabled preference.

Note: Preference names are case-sensitive. Search terms are not.

If you enter a search term and a preference does not exist, you will have the option to add a new preference (see below).

Modifying preferences

To change a boolean (true-false) preference's value, double-click on the preference.

Alternatively, you can click the Toggle button.

To change a string (text) or a number preference's value:

Double-click on the preference.
- Alternatively, you can click the Edit button.
Enter a new value.
Click on the Save button to save the change.

Resetting or deleting preferences

To reset a preference to its default value, click the Reset button.

To remove an added preference, click the Delete button. If you added the preference entry yourself, it will no longer be listed after restarting Firefox. Note:

Delete

button may be shown for some preferences that appear in bold type that you did not modify or add, such as preferences whose values are system-specific. Those preferences will be added back, as appropriate, if deleted.

Adding preferences

To add a new preference, enter its name into the Search preference name box at the top of the about:config page. At the bottom of the search results (if any), there will be the option to create a new preference. To do so, specify the type of value that preference will store:

Boolean is true or false.
Number is an integer.
String is any sequence of text.

Click the Add button to create the new preference and set its value. Boolean preferences are set to true by default, use the Toggle button for them to change the value. For string or number preferences, enter a value and click the Save button.

Click the Delete button to discard the new preference (see above).

Based on information from About:config (mozillaZine KB)

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