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PDF won't display without plugin

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I've used the built-in PDF viewer in firefox for quite a while to view PDFs without the need for a plug-in. But with FF38, that no longer works. The PDF just gets downloaded even though the option is set to preview in firefox. If I enable the Adobe plug-in, I can view the file but the browser is supposed to be able to handle this, and did quite nicely for quite a while.

I've used the built-in PDF viewer in firefox for quite a while to view PDFs without the need for a plug-in. But with FF38, that no longer works. The PDF just gets downloaded even though the option is set to preview in firefox. If I enable the Adobe plug-in, I can view the file but the browser is supposed to be able to handle this, and did quite nicely for quite a while.

Chosen solution

Hi drsaaron, please check Adobe Reader Application settings, and if that does not help try to delete the mimeTypes.rdf file in firefox profile folder.

thank you

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Suluhisho teule

Hi drsaaron, please check Adobe Reader Application settings, and if that does not help try to delete the mimeTypes.rdf file in firefox profile folder.

thank you

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Just deleting the mimetypes.rdf file didn't fix the problem for me. I also had to go into Options --> Applications and set the application for PDFs to "Preview in Firefox". That did the trick.

Modified by cfcentaurea