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Mozilla add-ons are installable enhancements to the Mozilla Foundation's projects, including Firefox, Thunderbird, SeaMonkey, and Sunbird. Add-ons allow the user to add or augment application features, use themes to their liking, and handle new types of content. There are three types of add-ons: "Extensions", "Personas" and "Plug-ins". The main repository for distributing the first two type is the eponymous ''Mozilla Add-ons'' website. ==Types== There are several types of add-ons: * Extensions: Modify the behavior of existing features or add new features. The feature could be something in the user interface or a functional feature that manifests itself when a certain action is performed. Themes are examples of extensions that primarily concern themselves with the user interface. Search engine definitions are examples of functional extensions. A list of extensions can be found in the ''List of Firefox extensions'' article, although there are others for Thunderbird, SeaMonkey and Sunbird. * Themes: Formerly known as "Personas". Strictly modify certain elements of the user interface. Their most prominently featured change is the background image that they add to toolbars, menu bars and status bars of the main application window. They may change the text and background color as well. * Plug-ins: Render web contents that the program cannot natively render. For example, Adobe Flash Player is such a plug-in; it renders embedded Adobe Flash contents in web pages. The framework that enables creation of Mozilla plug-ins is called NPAPI. Mozilla plug-ins are being phased out; Mozilla plans to discontinue most plug-ins in Firefox by 2016. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Add-on (Mozilla)」の詳細全文を読む スポンサード リンク
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