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An Adobe Reader update can cause PDF files to be unreadable in Firefox. We'll explain how to fix this and cover options for viewing PDF files.

When you install or update Adobe Reader, it installs the "Adobe Acrobat NPAPI Plug-in" for viewing PDF files inside your browser. The problem is that this plugin does not work in Firefox. The PDF file may be blank or you may see the message, ''Adobe Reader cannot show documents in this browser''. We'll explain how to fix that. {for fx19} * If you are having other issues when viewing PDF files with the build-in PDF Viewer, see instead [[View PDF files in Firefox without downloading them#w_troubleshoot-problems-with-the-pdf-viewer|Troubleshoot problems with the PDF viewer]]. {/for} {for win,linux} {note}'''Note:''' This article only applies to Mac computers.{/note} {/for} In order to view PDF files again follow these steps: # On the menu bar, click on the {menu Firefox} menu and select {menu Preferences…}. # Select the {menu Applications} panel. # Type '''pdf''' into the search bar. # For each content type listed, click on the drop-down menu in the '''Action''' column and change the selection to use (if available) {for fx19}Preview in Firefox,{/for} Preview, Adobe Reader, or PDF Browser Plugin (if you are using the Schubert PDF plugin). # Close the Preferences window.<br> {for fx19} [[Image:Preview in Firefox]] {/for} {for not fx19} [[Image:Reader plugin - Mac]] {/for} You can also view PDF files inside Firefox with [http://www.schubert-it.com/pluginpdf/ Schubert|it PDF Browser Plugin]. [[Template:ShareArticle|link=http://mzl.la/LCWQaZ]]