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Preview in Firefox for PDF stopped working with FF 73.0.1

  • 6 antwoorden
  • 1 heeft dit probleem
  • 9 weergaven
  • Laatste antwoord van cor-el

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I updated to FF 73.0.1 a couple days ago and now when I navigate to a PDF file, it no longer will Preview in Firefox. Instead, it goes to the Save File option.

I've tried setting it in the Options/Applications and all the other choices work fine except the Preview in Firefox.

I updated to FF 73.0.1 a couple days ago and now when I navigate to a PDF file, it no longer will Preview in Firefox. Instead, it goes to the Save File option. I've tried setting it in the Options/Applications and all the other choices work fine except the Preview in Firefox.

Alle antwoorden (6)

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Is the builtin PDF Viewer still enabled if you check pdfjs prefs (pdfjs.disabled) on the about:config page ?

You can open the about:config page via the location/address bar. You can accept the warning and click "I accept the risk!" to continue.


See also:

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pdfjs.disabled is set to its default value of false. That's not it.

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I think I figured it out. The website's links to the pdf files were ftp. When I tried a website with https it worked as expected.

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How does the server send the PDF file if you check this in the Web Console (Requests and XHR) and Network Monitor ?

If the file is send a "application/pdf" then Firefox will open the file in a Firefox tab. If the file is send with another content type then Firefox will offer to save the file.

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I am unable to determine how the file is sent. Looking at the source, there's a <a> tag with the href="ftp://..." but also has target="_blank" so it's opening a new tab and then doing the save box. So there is no console view on the new tab.

I'm not going to worry about it any more.

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You can alternatively use the Browser Console and enable messages from content processes via the cogwheel button in the Console.