Drag-and-drop test for Gecko-based applications (Firefox & Co)

dndTest.js

function dndTest(e) {
	var dt = e.dataTransfer;
	setTimeout(function() {
		var types = dt.types;
		var c = dt.mozItemCount;
		var r = [];
		for(var i = 0, li = types.length; i < li; ++i) {
			var type = types.item(i);
			r.push(i + ": " + type);
			for(var j = 0; j < c; ++j) {
				var data = dt.mozGetDataAt(type, j);
				if(data)
					r.push("  " + j + ": " + data);
			}
		}
		Components.classes["@mozilla.org/consoleservice;1"]
			.getService(Components.interfaces.nsIConsoleService)
			.logStringMessage("DND test:\n" + r.join("\n"));
	}, 0);
}
addEventListener("dragstart", dndTest, true);
setTimeout(function() {
	removeEventListener("dragstart", dndTest, true);
}, 15e3);

Moved to https://github.com/Infocatcher/Custom_Buttons/tree/master/tests#dndtestjs