mwop, So irritated that #firefox decided NOT to support PWAs on Linux. (Yes, I know about the extension, but it's a PITA to keep up-to-date, and because it uses an ADDITIONAL runtime in the background, it's a waste of system resources.)
I've concluded that the only way to use Outlook consistently on Linux is via the web (love OWL for TB, but invites/events often disappear)... and without reasonable PWA support in FF, I'm having to contemplate returning to a chromium-based browser. 😥