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What I don't understand is why Google doesn't have an open source PDF viewer? I mean, Chromium renders OpenGL, decodes movies, contains fastest JavaScript VM and it cannot view PDFs? Given what they did to JavaScript speed, can you imagine what viewer they would be capable of producing of? At least they should join Mozilla on improving pdf.js, IMO...

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Chrome already has its own PDF viewer, presumably implemented in C or C++ or whatever, so they probably don't care about making it available for Chromium. Perhaps they bought the rights to the source code they based it on, and are unable to open source it.

Google pays to ship FoxIt's closed-source PDF engine with Chrome.

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