Mozilla's latest version of Firefox conveniently includes a built-in PDF viewer. If you prefer your own PDF viewer, here's how to change it.

Change PDF Viewer in Firefox After you install a PDF viewer plugin, select the default viewer to use when you open a PDF document in Firefox by clicking the "Firefox" button, then the "Options" entry.

By default, both Firefox and Chrome open PDF files using a built-in reader. Even if you disable this reader or use another browser, your PDFs may open in the browser through the Adobe Reader ...

The Microsoft Edge browser is the default app for PDF files on Windows PCs. However, you can easily change your default PDF viewer to Adobe’s Acrobat Reader DC for files saved to your Windows PC.

To change the default PDF viewer on Windows, right click any PDF file and select ‘Open With’ and then ‘Choose another app’.

You can ditch Microsoft Edge and set another app as your default PDF reader, and in this guide, we'll show you how on Windows 10.

To change the default PDF viewer on Windows 10, you'll need to edit your default apps in the Control Panel.

The Microsoft Edge browser is the default app for PDF files on Windows PCs. However, you can easily change your default PDF viewer to Adobe’s Acrobat Reader DC for files saved to your Windows PC.