I got a new laptop and downloaded the latest Firefox. However, it does not save PDF's as PDF's anymore; instead, it saves them as Firefox Document. This is annoying. All else works fine, but it created issues when I send them to someone. I have to open them in Adobe, save as PDF and then it works. I've gone into "Options" and changed "Applications" -> Portable Document Format (PDF) to "Action": Use Adobe Acrobat Reader DC but it didn't help.