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→Introduction
=Introduction=
In the [[Dive into Mozilla Modifying Firefox Lab|previous lab]] we made a small change to the behaviour of Firefox by modifying the browser's source code. In this lab we explore how to achieve the same effect using an '''extension''' rather than modifying the tree. ''(Thanks to [http://www.starkravingfinkle.org/blog/ Mark Finkle] for the idea of redoing this as an extension.)''
The goal of this exercise is to expose you to Firefox extensions and to show you how to modify or extend the browser without changing its source code directly. Some thought will also be given to the two methods of doing this (i.e., in the tree vs. as an extension), comparing their advantages and disadvantages.