About:config: Difference between revisions
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<tt>about:config</tt> (one of the special [[About_protocol_links|about: links]]) lists application preferences read from "prefs.js", "[[user.js]]" and from program defaults, many of which are not present in the Options and Preferences dialog. You can use about:config to modify these preferences and to add other "hidden" preferences. | |||
'''Warning''': Changing these values can, in rare circumstances, break Mozilla Suite, Firefox, or Thunderbird or cause strange behavior. Only modify these preferences if you know what you are doing. | |||
==Opening about:config== | ==Opening about:config== | ||
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==Adding modifying and resetting preferences== | ==Adding modifying and resetting preferences== | ||
To add a new preference, context-click (right-click) anywhere in the list of preferences, select | To add a new preference, context-click (right-click) anywhere in the list of preferences, select ''New'' then select the type of preference. ''String'' is textual, ''Boolean'' is true-false and ''Integer'' is numerical. | ||
To modify an existing preference, context-click (right-click) on the preference, select | To modify an existing preference, context-click (right-click) on the preference, select ''Modify'' and type in the new value. In some cases, ''Toggle'' will be the selection offered for boolean (true-false) preferences. | ||
To reset a preference to its default value or to remove an added preference, context-click (right-click) on the preference and select | To reset a preference to its default value or to remove an added preference, context-click (right-click) on the preference and select ''Reset''. | ||
==about:config entries== | ==about:config entries== | ||
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* [http://preferential.mozdev.org/ Preferential extension] — An extension similar to about:config with extra features, such as documentation for some preferences. | * [http://preferential.mozdev.org/ Preferential extension] — An extension similar to about:config with extra features, such as documentation for some preferences. | ||
* [[About protocol links]] — other about: pages. | * [[About protocol links]] — other about: pages. | ||
[[Category:Configuration]] | |||
Revision as of 12:04, 19 September 2005
about:config (one of the special about: links) lists application preferences read from "prefs.js", "user.js" and from program defaults, many of which are not present in the Options and Preferences dialog. You can use about:config to modify these preferences and to add other "hidden" preferences.
Warning: Changing these values can, in rare circumstances, break Mozilla Suite, Firefox, or Thunderbird or cause strange behavior. Only modify these preferences if you know what you are doing.
Opening about:config
- In Firefox and Mozilla Suite, type "about:config" (without quotes) in the Location Bar and press Enter.
- In Thunderbird, use the AboutConfig extension. Starting with Thunderbird 1.5, about:config is accessible from the "Tools" menu (Options > Advanced > Config Editor button).
- There's a version of AboutConfig extension compatible with Nvu here.
Adding modifying and resetting preferences
To add a new preference, context-click (right-click) anywhere in the list of preferences, select New then select the type of preference. String is textual, Boolean is true-false and Integer is numerical.
To modify an existing preference, context-click (right-click) on the preference, select Modify and type in the new value. In some cases, Toggle will be the selection offered for boolean (true-false) preferences.
To reset a preference to its default value or to remove an added preference, context-click (right-click) on the preference and select Reset.
about:config entries
This article contains a list of valid about:config entries and their possible values. (That article is a reference for what each preference does, it is not the place to edit your preferences.)
References
- A brief guide to Mozilla preferences
- MozillaZine Tutorial for about:config — Step by step guide with screenshots.
- Mozilla Help: Editing Configuration files — user site: ilias.ca
- Preferential extension — An extension similar to about:config with extra features, such as documentation for some preferences.
- About protocol links — other about: pages.
