cross platform component object model (XPFE) (XPCOM)

Cross Platform Component Object Model (XPCOM) is a platform-independent component technique in Mozilla. Normally, components in Mozilla are written in the C++ programming language, but there are also bindings for Python and Ruby.

With XPCOM, software developers can develop their own plug-ins that can be run in conjunction with the Mozilla framework. XPCOM supports this work with various language bindings.

XPCOM complements the XML User Interface Language( XUL) and supports access to Gecko components.