A mozilla magazine forum poster, gensym, described it well on March 8th, 2010:
A concrete example is when the "extended running time of a script" is caused by (or triggered while) a File Save dialog is open: the unresponsive script warning dialog will then pop up logically _behind_ the File Save dialog (at least in Mac OS X, panther (10.3) through leopard (10.5)).
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