XPCOM registers new components.

XPCOM注册新的组件。

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XPCOM fires a shutdown notification to all registered observers.

XPCOM发出关闭通知给所有注册的观察者。

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Another reason for much of the complexity in Gecko is the use of XPCOM, a powerful component system.

Gecko过于复杂的另外一个原因是XPCOM，一个强大的组件系统。

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