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Merriam-Webster Online Dictionary
add-on (noun)
something added on as
a) a sum or amount added on
b) something (as an accessory or added feature) that enhances the thing it is added to - computer hardware add–ons
add-on (adjective)
being or able to be added on - an add–on device
able to be added to - add–on certificates of deposit
Plug-in_(computing) (Wikipedia)
Mozilla Firefox displaying a list of installed plug-ins

In computing, a plug-in (or plugin, add-in, addin, add-on, addon, or extension) is a software component that adds a specific feature to an existing computer program. When a program supports plug-ins, it enables customization. The common examples are the plug-ins used in web browsers to add new features such as search-engines, virus scanners, or the ability to use a new file type such as a new video format. Well-known browser plug-ins include the Adobe Flash Player, the QuickTime Player, and the Java plug-in, which can launch a user-activated Java applet on a web page to its execution on a local Java virtual machine.

A theme or skin is a preset package containing additional or changed graphical appearance details, achieved by the use of a graphical user interface (GUI) that can be applied to specific software and websites to suit the purpose, topic, or tastes of different users to customize the look and feel of a piece of computer software or an operating system front-end GUI (and window managers).

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