Can't open PDF files in Firefox 16.0.1

Mac OS 10.6.8, Firefox 16.0.1, PDF Viewer 0.6.39 installed. In Firefox>Preferences>Applications, PDFs are supposed to be handled by the PDF Browser 2.4.4 plug-in for Preview. However, when I try to view a PDF in Firefox, I get this:
"We are sorry, but Adobe Reader is unable to show documents in this browser configuration.
"Please use your browser to download this file and open it in Adobe Reader or Adobe Acrobat.
"To avoid this message in the future, many browsers provide a way to turn off certain add-ons, and some are able to show this document natively. Please contact your browser vendor for more details."
Why is Adobe Reader trying to open the PDF when Preview is the default? How do I disable Adobe Reader from doing anything in Firefox?

cor-el, you nailed it.
There was a plug-in called "Adobe Acrobat NPAPI". With that disabled and the PDF Browser Plugin 2.4.4 enabled, I can now open PDFs in Firefox.

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Can't open pdf files with firefox

After searching for a certain topic on Google I've tried to open the link with a pdf file, but nothing happens.
I receive an error message as if the Proxy that we use here at the company was refusing the connection, but in fact, I've already configured it correctly. This error started after the last update to Firefox 33.0.2.
I've already tried to change the configurations at Options > Applications > Portable Document Format with the option use Adobe Reader (default) and use Adobe Acrobat (in Firefox), and also installed an Plugin "PDF Viewer", but nothing solved the problem.
Does anyone has the same problem?
Thanks

■ Use '''Tools -> Options -> Applications ->''' then look under content for Adobe Acrobat forms etc;
 note a choice of options is usually available
* see [[Options window - Applications panel]]
Firefox is of course a web browser. Acrobat reader is Adobe's program used to read and display the pfd files on your computer. Other programs may be used instead of Acrobat reader. You would normally have the Acrobat program and the pdf file present on the local computer, often both on the same hard drive, if you were opening individual pdf files directly with Acrobat.
Firefox uses a plugin so that it may use Acrobat to open pdf files and display the results within a firefox window or tab. If you do not have that plugin installed, or it is not enabled firefox may be unsure what to do with the file and offer to save it to whatever your default local download location is, without attempting to open the file in firefox.
■Also see
* [[Opening pdf files within firefox ]]
*[[Using the Adobe Reader plugin with Firefox]]

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ucmary wrote:
I can't open pdf files on Firefox, however, I can open them on Safari. What can I do to get Firefox to open my pdf files?
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* https://support.mozilla.org/kb/pdf-files-are-blank-and-cant-be-downloaded-mac
* https://support.mozilla.org/kb/Opening+PDF+files+within+Firefox
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Can't open PDF files in Firefox 16.0.1

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