Drag-drop problem for the case nuxeo in iframe

When nuxeo page is in iframe, the dragdop doesn't work.
I change code for the http://hg.nuxeo.org/desktop-integration/nuxeo-dragdrop/nuxeo-dragdrop-ff-extension/chrome/chromeFiles/content/customdragdrop.js
to make it works for both nuxeo in main page and iframe.