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Chapter 4. Managing Profiles > Using about:config

Using about:config

When Firefox loads, it first loads all the default preferences. It then loads the preferences stored in prefs.js. Finally, it loads the preferences stored in user.js. Any setting in prefs.js overrides the default value. Any setting in user.js overrides both the default value and the setting in prefs.js—if one exists. Any change made using about:config updates prefs.js—if there is an entry for the preference in user.js, this change is ignored in favor of the user.js setting. Just remember the precedence order: Firefox defaults load first, prefs.js loads second, and user.js (if present) loads last.

The preferences in about:config are essentially ported from Mozilla. Many have not been implemented in Firefox, and there might be no plans to actually implement them. If you find that changing one of these items does not have an effect, or the effect observed was not the one expected, this is why.


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