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firefox is blocking pdf files from opening

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when I try to open a pdf file from inside firefox I get an error message in Acrobat Reader saying that the file format is wrong. Same scenario in internet explore, the pdf file opens with no problem

when I try to open a pdf file from inside firefox I get an error message in Acrobat Reader saying that the file format is wrong. Same scenario in internet explore, the pdf file opens with no problem

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