Saturday 21 September 2019

How can I view a PDF in Firefox when the server specifies the wrong content type?

I am using Mozilla Firefox with a PDF viewer plug-in. The plug-in has been correctly associated with Adobe Reader files to view them in the browser in the settings.


I would like to be able to view PDF files in Firefox rather than downloading them. This already works correctly when a web server indicates that a file has the Content-Type of application/pdf. However, some web servers provide other Content-Types for PDFs, such as application/octet-stream. (See this example of a PDF served with a non-pdf Content-Type.)


I have looked at Firefox's MimeTypes.rdf file, and it appears to only support mapping applications based on file extensions for non-Internet-based files. (It looks like it only uses Content-Type to map Internet-based files.)


How can I have Firefox view all PDF documents in-browser rather than only the ones with the application/pdf Content-Type?

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