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FREE3OF9 barcode font not displaying in Firefox's new built-in PDF viewer


I have a PHP web app that uses FPDF (v1.53) and the FREE3OF9 barcode font to dynamically generate a PDF which includes a barcode in it. The font is imported into the document using the FPDF AddFont method (http://fpdf.org/en/doc/addfont.htm). In versions of Firefox prior to 19, the PDF opened in a new tab, was displayed by the Adobe Acrobat plugin, and the barcode showed up perfectly fine.

Now that Firefox 19.0 is using its own built-in PDF viewer, the barcode no longer displays at all -- there's just a blank spot where it should be. It continues to display fine in IE and Chrome. How I can get the font to display correctly in the newest version of Firefox?

I understand that I can change the Action for the PDF content type to 'Use Adobe Reader' in the options, but I'd prefer to fix this so that my users don't have to change their browser settings. Or at the very least, it would be nice if they could only change the Action for PDFs originating from my site and not globally.


Additional System Details

Installed Plug-ins

  • Next Generation Java Plug-in 10.15.2 for Mozilla browsers
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Shockwave Flash 11.6 r602
  • Google Update
  • Pando Web Plugin
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.5
  • Detector for the Onlive Game Client
  • VLC media player Web Plugin 2.0.2
  • Microsoft Lync 2010 Meeting Join Plug-in
  • 1.138.0
  • NVIDIA 3D Vision Streaming plugin for Mozilla browsers
  • NVIDIA 3D Vision plugin for Mozilla browsers
  • Picasa plugin
  • Intel web components for Intel® Identity Protection Technology
  • Intel web components updater - Installs and updates the Intel web components
  • 4.1.10329.0
  • 0.70.4


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0

More Information

  • Top 10 Contributor
  • Moderator
10740 solutions 96657 answers

Helpful Reply

You can set the pdfjs.disabled pref to true on the about:config page to disable the build-in PDF viewer and use the Adobe Reader instead.

See also:

  • Top 10 Contributor
2348 solutions 20818 answers

I've only used the PDF viewer a couple times so far, so I can't answer your question about whether it can be enabled/disabled on a site-specific basis.

On one PDF I opened, I saw had an infobar saying it might not display correctly and offering the option to open in another viewer. I'm assuming Firefox doesn't detect that it has a problem with your PDF.

As a short-run workaround, what do you think about changing the file disposition from inline to attachment? I think this might bypass the viewer by forcing a download.

header("Content-Disposition: attachment; filename=".$fname);

Question owner

Thanks for the suggestion. However, I think the users would prefer to change the Content Type Action rather than downloading the file. They're a fickle bunch.

  • Top 10 Contributor
  • Moderator
10740 solutions 96657 answers

If there isn't a MIME (content) type send yb the server or specified then Firefox may use the Adobe Reader plugin instead.

arronlee 0 solutions 4 answers

I'm studying about SDKs dealing with ***** generating Barcodes recently. I do hope there are more plugins for us to choose from.

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