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==A short description==
Extensions are small addons to a Mozilla product, such as Firefox or Thunderbird, that can extend the functionality of the browser to meet the user's needs.
==A longer detailed discussion==
Extensions allow a user to enhance their Mozilla product to meet their personal requirements without the core product being too bloated. It can be anything from a toolbar button to a small icon on the status bar to another addon to the right-click menu. Extensions can be created by anyone that has the the knowledge of the following extension-related technologies:
* XPI — Cross-Platform Installer module
* JavaScript – The primary language of Mozilla Browsers
* XUL (XML User Interface Language) – Used to define the UI (User Interface) and interaction with user.
* DOM (Document Object Model) – Used to change XUL in real-time or to edit HTML that is currently loaded
* CSS (Cascading Style Sheets)
* XPCOM/XPConnect
Extensions are installed via an [http://en.wikipedia.org/wiki/XPInstall XPInstall] module.
==Links to relevant resources, tutorials, examples, etc.==