Find Portable Document Format (PDF) in the list and click on the entry to select it.In the General panel, go down to the Applications section.Click the menu button and select Settings.

Click the menu button and select Options Preferences. In the Menu bar at the top of the screen, click Firefox and select Preferences. To switch from using the built-in PDF viewer to another viewer: You can also set a different third-party PDF viewer to handle PDF files, instead of Firefox’s built-in PDF viewer. Then, in the Downloads folder, right-click Control-click on the file, select Open with and choose your favorite PDF viewer.ĭisable the built-in PDF viewer and use another viewer.Hold down the control key while you click (two-finger click) the magnifying glass icon of the PDF file and select Show in Finder. Right-click on the file folder icon of the PDF file and select Open Containing Folder.Open the Downloads panel by clicking the download icon next to the address bar.To open a PDF file you downloaded in Firefox using another viewer: When Firefox is set as the default for viewing PDFs in the browser, you can still open downloaded PDF files with a third-party tool. Use a third-party PDF viewer for downloaded PDF files To learn more about the built-in PDF 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. This built-in PDF viewer is enabled by default. 4.4 Troubleshoot problems with the PDF viewerįirefox includes a built-in PDF viewer that allows you to view almost all PDF files found on the web without an external application (exceptions to this are PDF files with a MIME type incorrectly set).3 Set Firefox to ask you what to do with PDF files.2 Disable the built-in PDF viewer and use another viewer.1.1 Use a third-party PDF viewer for downloaded PDF files.

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