How to Set Firefox as the Default PDF Reader in Windows 10

This guide explains how to set Firefox as the Default PDF Reader in Windows 10, with clear steps, practical tips, and important checks before you begin.

Recently, new browser developers have started pushing for improvements and adding new features to their PDF Viewer tool , Firefox is no exception. Starting with Firefox 78, the built-in PDF viewer in Firefox (PDF. js) can be set as the default PDF reader tool on Windows 10. Mozilla has made a series of necessary changes for Firefox to browse. Can be installed as the default PDF processing tool on Windows 10, making it easy for users to manipulate PDF files on the system without installing additional third-party tools.

Basically, Firefox PDF Viewer comes with the following features:

• Printing support.
• Lets you download PDF files to save on your computer.
• Support a variety of different document views.
• Display PDF document thumbnails in sidebar.
• Be constantly updated by Mozilla with improvements, bug fixes and new features.

To turn Firefox into the default PDF reader in Windows 10, just follow these steps:

Step 1: Make sure you use Firefox version 78 and above. Navigate to Start> Settings> Apps> Default Apps.

Step 2: Scroll down and click on the ' Choose default apps by file type ' option.

Step 3: Continue scrolling down and looking for . pdf , click on the current default Program icon.

Step 4: In the ' Choose an app ' dialog box, select Firefox.

Step 5: Open any PDF file on the device, you will see this document displayed in Firefox.