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XPCOM itself provides a set of core components and classes, e.g. file and memory management, threads, basic data structures (strings, arrays, variants), etc. The majority of XPCOM components are not part of this core set and are provided by other parts of the platform (e.g. Gecko or Necko) or by an application or even by an extension.
- XPCOM reference
- This reference describes the interfaces and functions provided by the XPCOM library. In addition, it details the various helper classes and functions, as well as the components, provided by the XPCOM glue library. The contents herein are oriented primarily toward extension developers and people embedding XPCOM in other projects.