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Chapter 6. Power Firefox Tricks and Techniques > Creating and Editing user.js

Creating and Editing user.js

By default, Firefox does not have a user.js file. This file must be created by the user. There is neither a way to create the user.js file from Firefox, nor does Firefox update a user.js file. The user.js file is really the final say for preferences; it is processed last and its contents override prefs.js. (Firefox does update prefs.js based on the contents of user.js.) Because Firefox automatically updates and modifies prefs.js, Mozilla recommends (and I concur) that you not modify prefs.js. Instead it suggests adding those preferences you wish to set or modify in user.js.

There are two ways to create your user.js file. The first way, and perhaps the easiest, is to simply use a basic text-based editor (such as Window’s notepad program).


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