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aboutconfig edit

The Configuration Editor (about:config page) lets you view, change, or reset advanced preference settings in Firefox. Learn more.

The Configuration Editor (''about:config'' Advanced Preferences page) lists Firefox settings known as ''preferences'' that are read from the {filepath prefs.js} and {filepath user.js} files in the [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|Firefox profile]] and from application defaults. Many of these preferences are advanced settings that are not present in the [[T:optionsorpreferences]] 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. [[Template:aboutconfigwarning]] __TOC__ =Opening the Advanced Preferences page= [[T:aboutconfig]] [[Image:Fx71aboutconfig]] Click {button 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 {pref security.OCSP.enabled} preference. {note}'''Note:''' Preference names are case-sensitive. Search terms are not.{/note} If you enter a search term and a preference does not exist, you will have the option to add a new preference ([[#w_adding-preferences|see below]]). =Modifying preferences= [[Image:Fx71aboutconfigShowAll]] To change a '''boolean (true-false)''' preference's value, double-click on the preference. *Alternatively, you can click the ''Toggle'' [[Image:Fx71aboutconfig-ToggleButton]] button. To change a '''string (text)''' or a '''number''' preference's value: #Double-click on the preference. #*Alternatively, you can click the ''Edit'' [[Image:Fx71aboutconfig-EditButton]] button. #Enter a new value.<br>[[Image:Fx71aboutconfig-editpref]] #Click on the ''Save'' [[Image:Fx71aboutconfig-Checkmark]] button to save the change. =Resetting or deleting preferences= {note}'''Note:''' You can only reset or remove '''modified''' preferences, which are listed in bold type. To reset all preferences, see [[Reset Firefox preferences to troubleshoot and fix problems]].{/note} To reset a preference to its default value, click the ''Reset'' [[Image:Fx71aboutconfig-ResetButton]] button. To remove an added preference, click the ''Delete'' [[Image:Fx71aboutconfig-DeleteButton]] button. If you added the preference entry yourself, it will no longer be listed after restarting Firefox. {note}'''Note:''' A ''Delete'' [[Image:Fx71aboutconfig-DeleteButton]] 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.{/note} =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. [[Image:Fx71aboutconfig-addnewpref]] Click the ''Add'' [[Image:Fx71aboutconfig-AddButton]] button to create the new preference and set its value. Boolean preferences are set to {pref true} by default, use the ''Toggle'' [[Image:Fx71aboutconfig-ToggleButton]] button for them to change the value. For string or number preferences, enter a value and click the ''Save'' [[Image:Fx71aboutconfig-Checkmark]] button. Click the ''Delete'' [[Image:Fx71aboutconfig-DeleteButton]] button to discard the new preference (see [[#w_resetting-or-deleting-preferences|above]]). <!-- MZ credit --> <br><br> '''''Based on information from [http://kb.mozillazine.org/About:config About:config (mozillaZine KB)]'''''