sencha-cmd,sencha-touch-2.3,pdfobject
It's solved...For this purpose I added the url to the index.html, but its very IMPORTANT to add to the app.json the dependency... now I am glad!
Firefox's built-in PDF renderer is PDF.js, which does not expose itself to JavaScript the way traditional plugins do. Because of this, PDFObject does not currently support PDF.js detection. If Firefox is using PDF.js as the default PDF rendering option, PDFObject will fail. However, if you use pure markup to embed...