Add-on technologies

The technology behind an add-on may consist of one or more of the following: XUL (XML user interface language): This is used to design and define the user interface and the interaction with the user. A majority of the legacy Mozilla add-ons are written in XUL. It is one of the best and oldest ways to create a Mozilla add-on. Mozilla Jetpack: This is an add-on SDK aimed at speeding up the development time and minimising the learning period. It is also used to develop add-ons that do not require users to restart the system. JavaScript: This is the primary language of the Mozilla