Brave support PWA. but, Firefox don’t. So, here is the answer
For teams for Linux, this works well https://github.com/IsmaelMartinez/teams-for-linux
looks nice. But, I am sure it could be helpful to send your message or do some promotion to your contacts especially when WhatsApp is prevalent in certain countries like India/Indonesia etc
Signal does not support web app
Yes the infinite scroll on alexandrite is smoother than new Reddit
Alexandrite for desktop and Voyager for iOS & Android is nice combo
it doesn’t trigger UAC because the installation directory is different
https://www.reddit.com/r/firefox/comments/12fd19j/why_doesnt_firefox_desktop_support_pwas/ and https://bugzilla.mozilla.org/show_bug.cgi?id=1682593 (search for PWA)