Filedocument viewer PDFJS property Issue

I am using the property called PDF js in filedocumentviewer and the that I am facing is I have to set property for desktop as yes and no for mobile so that it should work in both the two devices. But for tablets and phablets it is not working fine.   How can i make the use of PDFjs property for different devices so that is should be stable for all the devices or if you guys can give a better solution for the same ???    
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