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Standard XPCOM components

There are a number of components provided in the standard implementation of XPCOM; these are as follows.

The XPCOM Category Manager.
The XPCOM Directory Service. This service returns the locations of "well known" directories in an OS-independent manner. For instance, it can give you the path of the system's temporary directory, desktop directory, current working directory, and so on.
A component implementing nsILocalFile.
The XPCOM Observer Service.
A component implementing nsIScriptableInputStream.

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