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A XUL extension
can includes the user interface (the XUL and Javascript source files, which
can be packaged as a .jar file), any XPCOM components (which can be compiled
C++, JavaScript components etc), defaults files for preferences introduced
by the Extension, and a manifest file that describes the Extension to the
Extension System.
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The manifest
file includes things like version, metadata that is shown in the Extension
manager like Extension Name, author, contributors, links to the home page,
compatibility information, a link to a remote update service that provides
information about available updates, etc.
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These pieces
are then combined and zipped and the file given the a name with the Ò.xpiÓ
extension, and then served from the web using the application/x-xpinstall
content type.
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