Wrong rendering by Firefox' built-in PDF viewer

There seems to be a render issue when opening this PDF: http://www.gp.org/real-difference/the-real-difference.pdf
At the bottom it shows: WWW.GP.o RG
While in other PDF viewers it simply shows: WWW.GP.ORG

'''Try the Firefox Safe Mode''' to see how it works there. The Safe Mode is a troubleshooting mode, which disables most add-ons.''
''(If you're not using it, switch to the Default theme.)''
* You can open the Firefox 4.0+ Safe Mode by holding the '''Shift''' key when you use the Firefox desktop or Start menu shortcut.
* Or use the Help menu item and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
''Don't select anything right now, just use "'Start in Safe Mode"''
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shift key) to open it again.''
'''''If it is good in the Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one.
Please follow the [[Troubleshooting extensions and themes]] article for that.
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''

Similar Messages

Cannot open pdf files with Firefox's built-in pdf viewer

This just started (I think) with Firefox 37.01. This is on Win7-X64. I cannot open pdf files with the Firefox built-in pdf viewer. If I click on the file or try to open it from within Firefox, it brings up a "opening filename.pdf" message. If I select the "Open with" radio button as 'Firefox (default),' it just keeps looping on this process; it never opens. In Tools => Options => Applications, Portable Document Format (PDF) is indicated as 'Preview in Firefox.' I've never had any other PDF viewer installed on this computer. I've tried disabling all plug-ins and extensions, but it still doesn't work. I searched for solutions but haven't found any for this specific issue.
Thanks for the help.

Hello,
Have you tried, to start Firefox in safemode you can do so by following these steps
'''If Firefox is open,''' you can restart in Firefox Safe Mode from the Help menu:
* Click the menu button [[Image:New Fx Menu]], click Help [[Image:Help-29]] and select ''Restart with Add-ons Disabled''.
'''If Firefox is not running,''' you can start Firefox in Safe Mode as follows:
* On Windows: Hold the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac: Hold the '''option''' key while starting Firefox.
* On Linux: Quit Firefox, go to your Terminal and run ''firefox -safe-mode'' (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
When the Firefox Safe Mode window appears, select "Start in Safe Mode".
;[[Image:SafeMode-Fx35]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, theme, or hardware acceleration. Please follow the steps in the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article to find the cause.
''To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
When you figure out what's causing your issues, please let us know. It might help others with the same problem.

A checked checkbox is rendered as unchecked in default pdf viewer of firefox. It is checked when the pdf is opened with adobe.

I am using DynamicPDF to render a PDF. There are multiple check boxes which are checked. When the PDF is opened in Firefox, none of the check boxes are checked. However, when I save the PDF and open with Adobe, check boxes are checked. There might be a problem with the Firefox built in PDF viewer as the built in PDF viewer for other browsers work fine.

Current Firefox versions have enabled a built-in PDF Viewer that doesn't have all features that other PDF readers like the Adobe Reader have or may not function properly otherwise.
You can change the action for Portable Document Format (PDF) from Preview in Firefox to use another application like the Adobe Reader or set to Always Ask in "Firefox > Options/Preferences > Applications".
You can set the pdfjs.disabled pref to true on the about:config page to disable the build-in PDF viewer.
You can check the value of the plugin.disable_full_page_plugin_for_types pref on the about:config page and remove the application/pdf part if present or reset the pref to the default via the right-click context menu if you want to display PDF documents in Firefox with another application (i.e. not the built-in PDF Viewer).
See also:
*https://support.mozilla.org/kb/view-pdf-files-firefox-without-downloading-them

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.
Thanks.

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.
*http://kb.mozillazine.org/about:config
See also:
*https://support.mozilla.org/kb/view-pdf-files-firefox-without-downloading-them

Install Firefox 19 without built-in PDF viewer to 300+ computers.

I would like to install Firefox 19 to my company, but the built-in PDF viewer does not suit our needs. I need a way to ensure when all 300+ machines are updated they use Adobe as the in-browser reader.
Setting the preferred pdf reader on each machine really isn't an option. If I can push a config file out with the package to ensure this, that would be ideal.

hello, you can try setting the '''pdfjs.disabled''' preference to '''true''' with the method described at: http://kb.mozillazine.org/Locking_preferences

Firefox 29 no longer prints properly from the built in PDF viewer

I print several EBAY labels a day. Just upgraded to firefox 29 (not realizing really what had changed - now regretting) and the built in PDF viewer no longer prints properly. It shows the label fine on the screen, but when sending to the printer (I tried two different ones) it just prints out two blanks pages. I tried a number of different printer settings and as i mentioned two different printers. Can't get anything to print now except two blank pages. If I switch the application settings in firefox to use an external 3rd party PDF viewer (e.g. Adobe reader 11, PDF Viewer plus, etc) those work fine. However, the default built in PDF viewer clearly broke in this new version. A very disappointing launch for me as this is critical feature for my use. Yes, I have a work around, but the point (and new bug) is still valid.

Go to Tools
Options
Applications
(Content Type) )Scroll down to Portable Document Format (PDF) (change Action to use Adobe Reader as Default or whatever PDF program you prefer.

How can I disable the new built-in PDF-viewer?

Hi Folks,
I recently got a strange problem with Nightly 15.0a1. All PDF documents are opened with the new built-in PDF viewer and it does not matter if it´s enabled or disabled - it just always opens and renders/loads the PDF file. But I want it to be done by Acrobat Reader, or save it to disk.
I tried Tools-->Options--->Applications and marked all PDF related stuff to "ask" or selected the Acrobat Reader, but it did not help at all.
Can anyone help me with this?

Hello,
Apparently we have to wait for
* [https://bugzilla.mozilla.org/show_bug.cgi?id=752676 Bug 752676 - Control pdf.js and Other PDF Plugins using Application Preferences]

How can I/Can I make Firefox the default .PDF viewer in Windows 7?

For the basic PDF viewing I do, Adobe Reader is just slow and annoying. I love using Firefox, but unfortunately I cannot set it as the default program to open PDF files. Even when I select Firefox after right clicking and select open with, Windows does not comply. Is there a config option I can change that will allow me to set Firefox as the default PDF reader.
Thank you for your help.

You can not make Firefox the default for viewing PDF files for the entire Windows Operating System, only the default viewer from within Firefox. Like when PDF files that are downloaded from websites and displayed in Firefox; you can try using '''File > Open File''' from within Firefox to view PDF file that are already saved on that PC, but I'm not sure that will work - I haven't tried doing that.

PDFs look different in Adobe reader and Acrobat professional compared to the built in PDF viewer on windows 8

Hi there,
I have been trying to narrow down an issue we have been having for some time in printing PDF files and finding that they look different on paper compared to screen. Up until today our big KIP plotter got the blame, but as I have been collecting notes on a little windows 8 tablet I noted that PDFs opened in the windows PDF viewer have the same visual defects as the printouts. My example today is that on a CAD drawing there is a small box/frame with a number in their, I tried printing and the frame was completely blacked out. As a test I tried saving the PDF as a TIFF file from Adobe Acrobat professional and this file had the same fault as the printed copy. When I open it in the windows 8 pdf viewer I can see that there is a shading within this box that does not show on Adobe Reader (latest version 11.0.10.32), the adobe reader and acrobat pro version both show a white background to the box. We have been having lots of issues with sections being missing from drawings and overly feint lines.
I am not sure where to start trying to narrow down why we are getting different results in different PDF readers. Is there anyone who maybe able to point me in the right direction? It almost feels like the shading or colour density is not being consistent when PDFs are being opened in different packages.
Thanks in advance
Andy

Some PDF viewers comply with the PDF ISO Standard (ISO 32000) "just enough" while others (such as Adobe's) fully comply.
As with anything there's a cost to using anything that comes from a "just enough" approach.
Be well...

Firefox 19.0 pdf viewer ignores pdf encryption - how do I get it to honor the encryption?

I encrypted a pdf with Adobe Acrobat so that the document's text couldn't be copied. However with the new Firefox pdf reader, the reader completely ignores this encryption so that the document's text can be copied.

I can confirm that problem: http://www.jeffersonscher.com/forumshots/no-copy.pdf
I guess the "security" offered by this feature is not very good if it's up to the viewer to honor it!
You might want to file a "bug" for this (you could do that on https://bugzilla.mozilla.org/enter_bug.cgi -- that's a new registration, separate from this forum). If you do, please note the number here for reference.

Built-in PDF viewer could better render low quality PDF using the recognized text

I've been a little frustrated with this. When I view a low quality PDF on a university website, zooming in/out on firefox (v34.0 and v35.0.1 on linux is what I've tried) proves that the quality could be drastically improved. The original fonts looks like the pdf-lowqual.png file below: (unable to upload images on here)
http://i59.tinypic.com/169kkcw.png
While zooming in or out, the font displays as normal "hypertext" or whathave you before going back to looking ugly again, as seen here:
http://i61.tinypic.com/2gvptw0.png
Is there a way to permanently display the recognized text with local or internet fonts? I assume the text is recognized as that is what allows one to select text.

[[Use the Adobe Reader plugin to view or download PDF files]] or [[View PDF files in Firefox without downloading them]] are the current offerings for viewing pdfs in Firefox.
However, there are alternatives like embedding fonts into the pdf. I do also know that there are web safe fonts with similar function: [http://en.wikipedia.org/wiki/Web_typography#Web-safe_fonts]

Font seems wrong using firefox built-in pdfjs

I am using firefox built-in pdfjs to view this pdf [1]. But it seems that the letter "t" is not shown correctly, which is shown in its bold style. and only the letter "t" but not any letter else goes wrong.
I'd like to insert a image here, but I don't know how to... TAT
[1]http://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/GSWLaTeX.pdf

The latest stable and latest development versions of the built-in PDF viewer are available as an extension and these version can possibly perform better than the version shipped with the current Firefox release.
Latest development version of the PDF Viewer (pdfjs) extension:
*http://mozilla.github.io/pdf.js/extensions/firefox/pdf.js.xpi
Latest stable version of the PDF Viewer (pdfjs) extension:
*https://addons.mozilla.org/firefox/addon/pdfjs/

Firefox pdf viewer garbles embedded text on some of our pdfs (on Mac OS Mavericks). They're fine in Safari or when downloaded. This is a major problem.

Firefox pdf viewer messes up text on pdfs and makes them unreadable. These fonts are embedded, so there shouldn't be a problem. The pdfs are fine when viewed in Safari or Chrome browsers. Also fine when viewed through Acrobat. Telling me to change my default browser isn't good enough. Visitors to our web site won't know this.

The latest stable and latest development versions of the built-in PDF viewer are available as an extension and these version can possibly perform better than the version shipped with the current Firefox release.
Latest development version of the PDF Viewer (pdfjs) extension:
*http://mozilla.github.io/pdf.js/extensions/firefox/pdf.js.xpi
Latest stable version of the PDF Viewer (pdfjs) extension:
*https://addons.mozilla.org/firefox/addon/pdfjs/

PDF Viewer plugin for Firefox 4 on Mac

Firefox 4 on Mac would not come with a plugin for pdf viewing, you need to install the file below (just copy and paste in your browser and allow to install):
http://firefox-mac-pdf.s3.amazonaws.com/fx-quartz-pdf-1.2.0.xpi
(you need to run Firefox in 32 bit mode ! go to applications, select Firefox and open "get info", check box for 32 bit mode)

https://support.google.com/chrome/answer/142056?hl=en
https://support.google.com/chrome/answer/142064?hl=en
Those links have more info on Chrom plugins and how to enable or disable them.
From the first link:
By default, Chrome uses a built in viewer to open PDFs. If you've disabled the built-in PDF viewer, Chrome will use Adobe Acrobat or Adobe Reader to display PDFs. Follow the suggestions at the first link if you're having trouble viewing PDFs within Chrome, using Adobe Acrobat or Adobe Reader.
First check if the issue is specific to Chrome. Try opening PDFs in another browser on your computer, such as Firefox. If you experience similar problems viewing PDFs in another browser, the issue is likely not related to Chrome.

How to enable the default pdf viewer of firefox after installing acrobat 11?

I installed acrobat 11, and i dont like its pdf viewer add-on, so i want to switch back to firefox's default pdf viewe, but i cant change the action in the application option to preview in firefox. i also tried disabling the acrobat plugin.
Firefox 27, windows 8.1,

thanks for the help.

Wrong rendering by Firefox' built-in PDF viewer

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