

Note: When Open in Firefox is the selected action, the built-in PDF viewer is used.

When Firefox is set as the default PDF viewer and you download a PDF file in Firefox and save it to your computer, you can use a different application to view those PDF files by following these steps: Use a different PDF viewer for downloaded PDF files When you're viewing a PDF file in Firefox, you can use the download button in the PDF viewer's toolbar to download and save the PDF file to your computer. The built-in PDF viewer will open the PDF file in Firefox without saving it. (To learn more about the built-in viewer, see Using Firefox's built-in PDF viewer, below.) When you click on a link to a PDF file or open it from the Firefox Downloads panel, it will be rendered with the built-in PDF viewer.
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The built-in viewer is used when Portable Document Format (PDF) files are set to Open in Firefox in your Firefox settings for different types of files.
