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Why firefox does not support inline PDFs? How to view inline PDFs on firefox?

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It is sure that PDFs are set as 'Preview in Firefox', but after I open a website, it shows ' This browser does not support inline PDFs. Please download the PDF to view it: Download PDF'. I don't know how to fix it, please help!

It is sure that PDFs are set as 'Preview in Firefox', but after I open a website, it shows ' This browser does not support inline PDFs. Please download the PDF to view it: Download PDF'. I don't know how to fix it, please help!

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Let's continue in your other thread here: https://support.mozilla.org/questions/1257109