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If you type about:config in your address bar, Firefox opens the master directory of user-defined preferences and built-in settings. The ultimate arena for performance tampering, the about:config settings are the foundation for programming Firefox extensions.
We’ll show some simple about:config modifications below. Even if the word “Boolean†means nothing to you, we’ll try to make it easy to understand about:config settings. For power users, Mozillazine.org has a comprehensive list of about:config settings, their meanings, and how to modify them. Btw, although the screenshots below were made on a Mac, all of these hacks work for Windows users too.
To modify about:config, pull it up using your address bar. The settings appear in a searchable list view.

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