Pdfview.js render blurry

I am running the lastest ff build 28.
When I view the pdf with pdfview.js, the font is rendered blurry. However, after I zoom in the pdf, the font will be rendered clearly.
I wonder is it possible to let the pdfview.js render the fonts clearly in the first place.
(For test reproduction, view a pdf file in ff, try zoom in and see the difference)

Hello,
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