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.
Weâ€™ll show some simple about:config modifications below. Even if the word â€œBooleanâ€ means nothing to you, weâ€™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.