Yep, PWAs for Firefox is one I’ve tried and it did not work for me (forget the exact issues, but they were insurmountable). Even with the helper app , which I think was required to add/manage the launchers to the application menu, it just didn’t work out.
I’ll dig around when I have some more time to see what Linux Mint ships. Chances are it can be installed on other distros or at least compiled.