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I am unable to open pdf files in firefox, and I have tried all the solutions proposed by others. How can I re-enable pdf viewing in firefox?

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I have recently switched to Firefox from Google Chrome, and I am finding that I am unable to open any pdf files from the web in any way in Firefox. I cannot download them and open them in Adobe Reader, and I cannot preview them in Firefox, nor can I use the Adobe plugin. I have tried to use the solutions posed by users on this site, but none of them have worked. Any time I make a change to settings to try to solve this issue, the change never allows me to view the pdf file, and the setting reverts to the previous setting after the browser has been restarted. I don't care how I view the file, but I need to either be able to view it as a preview or I need to be able to download it.

I have recently switched to Firefox from Google Chrome, and I am finding that I am unable to open any pdf files from the web in any way in Firefox. I cannot download them and open them in Adobe Reader, and I cannot preview them in Firefox, nor can I use the Adobe plugin. I have tried to use the solutions posed by users on this site, but none of them have worked. Any time I make a change to settings to try to solve this issue, the change never allows me to view the pdf file, and the setting reverts to the previous setting after the browser has been restarted. I don't care how I view the file, but I need to either be able to view it as a preview or I need to be able to download it.

Keazen oplossing

I'm using an adobe downloading add-on, 3.0.0.2, and I have disabled it. Now I can actually open pdf files in my browser as previews, or download them as I see fit. Thanks!

But clearly there's an error with the add-on.

Dit antwurd yn kontekst lêze 👍 1

Alle antwurden (9)

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Hello jofield, try to delete the prefs.js file and any prefs-n.js files where n is a number (e.g. prefs-2.js) and Invalidprefs.js if exist.

see fro more info: Corrupt preferences file

thank you

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Hello ideato,

I tried this solution, and it did not work. My pdf files still will not open.

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Any luck if you delete the mimeTypes.rdf file in profile folder ?

http://kb.mozillazine.org/File_types_and_download_actions#Resetting_download_actions

thanks again

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I have just tried this, and it did not work.. The pdf files just open to blank pages, even if I change the preference.

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Some Mac users have reported a flaw in the Adobe Acrobat plugin that leads to blank pages displaying for PDFs. There is a support article on that: PDF files are blank or cause an error message on Mac.

By the way, what is the PDF Download extension? If you disable that temporarily, does it change anything? You can do that here:

Tools menu > Add-ons > in the left column click Extensions

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Keazen oplossing

I'm using an adobe downloading add-on, 3.0.0.2, and I have disabled it. Now I can actually open pdf files in my browser as previews, or download them as I see fit. Thanks!

But clearly there's an error with the add-on.

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Note that if plugin.disable_full_page_plugin_for_types includes application/pdf that only the built-in PDF Viewer can be used to display PDF files. To use a PDF viewer plugin embedded (if that works on Mac) you would have to remove this content type from the plugin.disable_full_page_plugin_for_types pref. The built-in PDF Viewer only supports the application/pdf MIME type.

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I don't know if this is any help I have had a problem where the pdf files were not opening correctly which I think was the problem here. I spent hours of head scratching and have now found out what the problem is. Right click on the Adobe Reader Icon on the desktop. Select properties and then the compatibility tab. You will see the uppermost section in this screen is Compatibility mode. I have Windows 7 and mine was set to Windows XP. I changed that to Windows 7 and now the problem is resolved. In short use the above instructions to check you are using the right compatibility mode for the version of Windows you are using and your troubles should be over!!

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Hi PuzzledUser, it's worth checking the poster's system information before replying. This thread lists MacOS X, so Windows 7 vs. XP compatibility isn't relevant...