This article explains how to use the built-in PDF viewer, how to use another PDF viewer and how to fix the common issues you might encounter. Firefox includes a built-in PDF viewer that allows you to view almost all PDF files found on the web without a plugin.
The built-in PDF viewer is enabled by default. If you have installed a PDF viewer plugin but you have problems using it in Firefox, try these solutions:.
Click the menu button and select Exit Quit.
Mozilla Firefox - Print to PDF - No Add-On or Plugin Needed
Click the Firefox menu and select Exit. Click the Firefox menu at the top of the screen and select Quit Firefox. Click the Firefox menu and select Quit.
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See this compatibility document and this article for details. The following does not apply to bit Firefox , which has limited plugin support.
Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox. See also: How to disable the built-in PDF viewer and use another viewer.