One of the many compelling reasons why Mozilla Firefox is by far the most used browser by web developers and designers is it’s variety of Add-Ons that come free, can be easily integrated and used right from the browser.
This article gives suggestions on how to set up your Mozilla application for extension development.
Extensions add new functionality to Mozilla applications such as Firefox, SeaMonkey and Thunderbird. They can add anything from a toolbar button to a completely new feature.
Extensions are a form of Installable Bundle which can be downloaded and installed by a user, or provided pre-packaged with an application or by an external program.