.pdf and .png won't open in version 91.13.0
Upgrading my system to Debian 11, Tbird will not open either .pdf or .png attached files, but .jpg opens fine. .png is supposed to open with Firefox, .pdf with Atril. Both types of files open just fine with their respective applications when they've been saved to disk, but nothing at all happens when I click on them within an email. Is there a fix?