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Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

pdf file upon downloading becomes corrupted

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I downloaded a pdf file (certificate) from coursera.org, but the file gets corrupted and can't open using a pdf viewer.

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The website that provided the file appears to have forgotten to include the file extension at the end of the file name, so your computer doesn't know that it's a PDF file.

If you add .pdf to the file name, it should fix the problem.

I'm assuming this is a site-specific issue, but if it happens on every website that you try to download/view a PDF on, there may be a problem with your Firefox settings.