From Rosetta Code
This is an example of a library. You may see a list of other libraries used on Rosetta Code at Category:Solutions by Library.
XUL::Gui is a toolkit. It provides a system for creation and management of graphical user interface elements.

XUL is an application framework which was developed by Netscape in preparation for Netscape 6, but is now the basis behind Firefox and other Mozilla Suite applications such as Mozilla, Sunbird and Thunderbird. Gui is the toolkit component.

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