Firefox read blob error

[eflowbeach]

Hi,

This library works well in Chrome and Internet Explorer, but it fails in Firefox. It never makes it to the function here:
var shapefile = new Shapefile(
{
shp : me.shpurl,
dbf : me.dbfurl
}, function(data)
{
debugger; // never gets here
var features = parser.read(data.geojson);
vector.addFeatures(features);
});

Any ideas? Here is a screenshot of Firebug's output.