This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

ابحث في الدعم

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Adobe pdf plug in for firefox, 10.1.4 version, does not work but can not update to new version, why?

more options

Adobe pdf plug in does not work, when I tried to update following message appeared, "Adobe Reader 9.5.1 and lower has been blocked for your protection", how to solve this problem?

Adobe pdf plug in does not work, when I tried to update following message appeared, "Adobe Reader 9.5.1 and lower has been blocked for your protection", how to solve this problem?

All Replies (3)

more options

It's confusing that the forum software detected both 10.1.4 and 11.0.2. And that another page mentions a different version.

Which version of Adobe Reader or Adobe Acrobat do you actually have?

more options

I have version XI of adobe reader and Acrobat X pro, actually I see there are both versions installed, 10.1.4 and 11.0.2. However I disabled 10.1.4 version but still does not work.

more options

Could you review/adjust your preference for which program opens PDFs? I'm not sure how that drop-list behaves when there are multiple Adobe plugins. You might need to physically remove an old plugin file or two to make sure Firefox is not trying to use the old one.

Edit: actually this article describe how to use the Options dialog Applications section to review/change the setting: View PDF files using Firefox’s built-in viewer.

  • C:\Program Files (x86)\Mozilla Firefox\Plugins (only one want nppdf32.dll here)
  • In regedit.exe, check the following key for the source of obsolete plugins: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins

Both the file that stores download handling preferences, and the file which registers plugins, can be renamed and Firefox will regenerate them, so those remains options for further actions as well.

Modified by jscher2000 - Support Volunteer