FF only removed the SSB (site specific browser) feature on desktop which was in an alpha state. There was no announcement that Mozilla was going to remove the entire PWA features (such as service workers).
PWA is a set of modern web standards. "Supporting PWA" can mean many things but "Removing unfinished SSB" doesn't mean "Removing PWA".
Unfortunately, the pendulum is also swinging away from Firefox.
Re:GitHub Should Start an App Store
by crocodiletears on Sunday January 31, 2021 @12:30PM
(#25980564)
Only for desktop, I think.
Didn't Firefox recently announce they're discontinuing PWA features?