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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 a plugin for viewing PDF files inside Firefox and sets that as the default. The problem is that this plugin does not work. We'll explain how to fix that. {for fx19} * If you are having 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} {note}'''Note:''' We have blocked the Adobe Reader plugin so this should not be an issue any longer.{/note} {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 {for fx19}Preview in Firefox (if available), {/for}Adobe Reader, Preview or PDF Browser Plugin (if you are using the Schubert PDF plugin).<br>[[Image:Reader plugin - Mac]] # Close the Preferences window. 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]]