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3. Installation > 23. Play With the Preference System

Play With the Preference System

Dig underneath Firefox’s user interface and hack the preference system directly.

Firefox’s preference system holds many of the small configuration items of the Firefox browser. These items are hidden from the user: behind formal user interfaces, unimplemented by user interfaces, or invisible because no default values are recorded anywhere. This hack explains how to work with the preference system directly.

Understanding the Preference Database

The preference system is equivalent to a tiny database. It sits in memory while Firefox runs. The preference database is a thread-safe but single-user database. It consists of a single table of four columns:


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