XULRunner is a Mozilla runtime package that can be used to bootstrap XUL+XPCOM applications that are as rich as Firefox and Thunderbird. It provides mechanisms for installing, upgrading, and uninstalling these applications. XULRunner also provides libxul, a solution which allows the embedding of Mozilla technologies in other projects and products.
Firefox (from version 3) ships with a private XULRunner package, which can run any compatible XULRunner application using the -app switch: firefox -app application.ini is equivalent to xulrunner -app application.ini
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