Echo JS 0.11.0

I think the author is overestimating the impact of Firefox nowadays.
I don't see how PWAs are going to end in the near or far future. The major obstacle for them has been Safari.
What I actually fear is that Firefox will become less and less relevant.

I don't agree... in FF, the feature was always half baked and hidden... I actually want more/better support for PWAs.  Been using Edge a lot more lately, and my biggest complaint is that the "Install This Site As An App" option doesn't set it to it's own instance by default.  Some sites can request to become an app, and that seems to work though the header at the top is confusing and probably shouldn't be there.

Even then, the most common use of the feature is with mobile devices.

It shouldn't go away, it's the best counter to app store censorship.