Add-on: essentially anything that can be installed into the browser. This includes for example extensions, themes, plugins, dictionaries, language packs, search engines.
Extension: a package extending browser functionality, the extension format used by Firefox works in Gecko-based browsers only.
Plugin: means NPAPI plugins that are supported by all browsers but Internet Explorer (the latter uses the proprietary ActiveX technology instead).
http://stackoverflow.com/questions/7575658/firefox-add-on-vs-extensions-vs-plugins
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