How do I disable the built-in PDF viewer in Firefox?

@priscilla.langworth 

To disable the built-in PDF viewer in Firefox, follow these steps:

1. Open Firefox browser and click on the menu icon (three horizontal lines) at the top right corner.
2. Click on "Options" from the drop-down menu.
3. In the left-hand menu, click on "General".
4. Scroll down to the "Applications" section.
5. Look for "Portable Document Format (PDF)" in the list of applications.
6. Click on the drop-down menu next to it and select "Use Adobe Acrobat (in Firefox)" or "Use other viewer" if you have another PDF viewer installed.
7. Close the options window.

Now, when you click on a PDF link in Firefox, it will open in the external PDF viewer you have selected.