Configuration Editor for Firefox

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

Warning: Changing these advanced settings can sometimes suspension Firefox or crusade strange behavior. You lot should only exercise this if you know what you're doing or if you are following trustworthy advice.

Opening about:config

Type nigh:config in the address bar and press Enter Return .
A alarm folio may appear. Click Accept the Risk and Continue to get to the well-nigh:config page.

Fx71aboutconfig

Click Evidence All to view all preferences currently gear up in the profile or utilise the Search preference proper name box to filter the listing.

Searching for preferences

You can utilise the Search preference name box at the top of the about:config page to speedily discover specific preferences. For example, if y'all enter ocsp in the Search box, it will bring up the security.OCSP.enabled preference.

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

If you enter a search term and a preference does non exist, you volition have the choice to add a new preference (see below).

Modifying preferences

Fx71aboutconfigShowAll

You lot can double-click on a preference to change its value or you can exercise the following:

For a boolean (true-false) preference, click the Toggle Fx71aboutconfig-ToggleButton button.

For a string (text) or a number preference, click the Edit Fx71aboutconfig-EditButton push button and enter a new value.

Fx71aboutconfig-editpref

Click on the checkmark Fx71aboutconfig-Checkmark to salve the alter.

Resetting or deleting preferences

To reset a preference to its default value, click the Reset Fx71aboutconfig-ResetButton push button. To remove an added preference, click the Delete Fx71aboutconfig-DeleteButton button. If you added the preference entry yourself, information technology will no longer be listed after restarting Firefox.

Note: A Delete Fx71aboutconfig-DeleteButton button may be shown for some preferences that announced in bold type that you did not alter or add together, such every bit preferences whose values are system-specific. Those preferences will be added back, as appropriate, if deleted.

You can only reset or remove modified preferences, which are listed in bold blazon. (To reset all preferences, run into the article Reset Firefox preferences to troubleshoot and ready bug).

Adding preferences

Fx71aboutconfig-addnewpref

To add a new preference, enter its name into the Search preference name box at the top of the about:config folio. At the bottom of the search results (if any), there volition be the option to create a new preference. To practise so, specify the blazon of value that preference volition shop:

  • Cord is whatever sequence of text
  • Number is an integer
  • Boolean is true or false

Click the Add Fx71aboutconfig-AddButton button to create the new preference and prepare its value. Boolean preferences are set to truthful by default; use the Toggle Fx71aboutconfig-ToggleButton push button to change the value. For String or Number preferences, click the Save Fx71aboutconfig-Checkmark push button. Click the Delete Fx71aboutconfig-DeleteButton button to discard the new preference.

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