How is it not properly supported at the moment? Genuinely curious, I don’t use PWAs a lot but when I have it has worked fine with Firefox.
The experience is not as smooth, it just looks snappier in Chrome. Also some features (like wake locks) are not supported.
This is not so much related to “proper” PWA support, but you can’t install PWAs as desktop apps from Firefox, whereas you can from Chrome/Edge. It’s the only reason I use Edge, just to locally install PWAs.
I use this addon to get “installable” PWAs and it works great for me. I use three installed PWAs regularly and have several more installed.
Not sure, but Wiki has a bunch of footnotes that may explain
https://en.wikipedia.org/wiki/Progressive_web_app#Browser_support
Edit: it’s just this article, which seems like too much fluff to bother reading https://www.fastcompany.com/90597411/mozilla-firefox-no-ssb-pwa-support
