Editing configuration

From MozillaZine Knowledge Base

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Mozilla applications are highly customizable, and there are a number of standard ways to change their appearance and behaviour. Basic settings can be changed using the application's dialog boxes. The main Options or Preferences dialogs can be reached from the "Tools" or "Edit" menus. (See menu differences in Windows, Linux, and Mac.) This article describes methods for more advanced configuration.


Modifying preferences

To modify a preference in a browser application such as Firefox or SeaMonkey, type about:config into the address bar and press Enter. In Thunderbird, choose Tools – Options – Advanced – General and press the Config Editor... button.

You will be brought to a long list of preferences. To change an existing preference, double click on it. To add a new preference, context click (right-click on most systems) anywhere and choose New and the type of preference. You will be prompted for the preference name and initial value. For more detailed info on about:config, see its article.

While it's easier to use about:config for a single profile, it may be easier to use a user.js file if you need to make the same changes in many profiles.

Modifying appearance

To modify the way in which Web pages and e-mails are displayed, you should edit the userContent.css file. To modify the appearance of the application itself, you should edit the userChrome.css file.

How to edit configuration files

The ChromEdit extension provides a convenient way of editing configuration files. If instead you choose to edit your configuration files using your own text editor, you should consult the Manual editing advice.


If you experience problems when editing configuration files, consult the Troubleshooting article.

External links