Dragging and dropping in rich text example app

This works dragging and dropping from Chrome, however it doesn’t work on Firefox for me. Instead, u.toLocalFile() returns a blank string with Firefox.

Its actually stranger then this. In both browsers, if I drag and drop the image of the application above from this webpage it fails with a blank image. However, if I say go to Google and say do an image search drag and drop works with both browsers.