This article covers features introduced in Thunderbird 3

STEEL is the Scriptable Thunderbird Easy Extension Library. It is a FUEL-like set of interfaces to facilitate Thunderbird extension development.

Currently, STEEL has an steelIApplication interface that implements all the functions of extIApplication . The library has also been implemented in Firefox ("FUEL") and in SeaMonkey ("SMILE").


Although the STEEL steelIApplication object is preloaded into XUL scripts, it is not preloaded into JavaScript XPCOM code. The object needs to be accessed like any other XPCOM service:

var Application = Components.classes[";1"].getService(Components.interfaces.steelIApplication);

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