Browser / Version: Firefox 73.0
Operating System: Windows 10
Tested Another Browser: Yes
Problem type: Something else
Description: Print button for Microsoft's in-page PDF previewer does not work, and there is no easy way to open the PDF in Firefox's previewer.
Steps to Reproduce:
No relevant errors were spotted in the Browser Console or Web Console. Old Edge browser has the same problem.
In Chrome, the PDF loads into the built-in PDF extension/plugin instead of Microsoft's viewer, and printing works as intended there. Printing reportedly works in Brave (a Chromium-based browser) and Safari, too.
Same issue on https://outlook.office.com/mail
From webcompat.com with