There are a number of components provided in the standard implementation of XPCOM; these are as follows.
- nsCategoryManager
- The XPCOM Category Manager.
- nsDirectoryService
- 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.
- nsLocalFile
- A component implementing
nsILocalFile.
- nsObserverService
- The XPCOM Observer Service.
- nsScriptableInputStream
- A component implementing
nsIScriptableInputStream.