This is an archived page. It's not actively maintained.


STEEL is deprecated and will be removed as of Thunderbird 52. Consider using the functions found in AppConstants.jsm or Services.jsm instead

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").


extIApplication Objects

steelIApplication Objects


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);

Other Resources