Which GUI library is used to develop Mozilla Firefox?

Which开发者_开发百科 GUI library is used to develop Firefox?

Qt? GTK+? Windows native?

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Firefox uses a number of GUI toolkits, including the native Windows one, as well as GTK+ for X platforms. Sadly, there is no official support for Qt.

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I heard that firefox is using their own GUI based off of XML and its called XUL. At least that's what it sounds like if your read their articles on XUL.